New Photochromic Salt Spiropyran with Benzyl Substituent

2018 ◽  
Vol 482 (2) ◽  
pp. 220-224 ◽  
Author(s):  
M. B. Luk’yanova ◽  
A. D. Pugachev ◽  
V. V. Tkachev ◽  
B. S. Luk’yanov ◽  
G. V. Shilov ◽  
...  
Keyword(s):  
Benzyl Substituent

New Photochromic Spiropyran Salt with Benzyl Substituent

2018 ◽  
Vol 482 (4) ◽  
pp. 414-417
Author(s):  
M. Lukianova ◽  
◽  
A. Pugachev ◽  
V. Tkachev ◽  
B. Lukianov ◽  
...  
Keyword(s):  
Benzyl Substituent

scholarly journals The Effect of Surfactant-Modified Montmorillonite on the Cross-Linking Efficiency of Polysiloxanes

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2623
Author(s):  
Monika Wójcik-Bania ◽  
Jakub Matusik
Keyword(s):  
Total Pore Volume ◽  
Cross Linking ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
The Cross ◽  
Chain Lengths ◽  
First Time ◽  
Substituent Influence ◽  
Benzyl Substituent

Polymer–clay mineral composites are an important class of materials with various applications in the industry. Despite interesting properties of polysiloxanes, such matrices were rarely used in combination with clay minerals. Thus, for the first time, a systematic study was designed to investigate the cross-linking efficiency of polysiloxane networks in the presence of 2 wt % of organo-montmorillonite. Montmorillonite (Mt) was intercalated with six quaternary ammonium salts of the cation structure [(CH3)2R’NR]+, where R = C12, C14, C16, and R’ = methyl or benzyl substituent. The intercalation efficiency was examined by X-ray diffraction, CHN elemental analysis, and Fourier transform infrared (FTIR) spectroscopy. Textural studies have shown that the application of freezing in liquid nitrogen and freeze-drying after the intercalation increases the specific surface area and the total pore volume of organo-Mt. The polymer matrix was a poly(methylhydrosiloxane) cross-linked with two linear vinylsiloxanes of different siloxane chain lengths between end functional groups. X-ray diffraction and transmission electron microscopy studies have shown that the increase in d-spacing of organo-Mt and the benzyl substituent influence the degree of nanofillers’ exfoliation in the nanocomposites. The increase in the degree of organo-Mt exfoliation reduces the efficiency of hydrosilylation reaction monitored by FTIR. This was due to physical hindrance induced by exfoliated Mt particles.

Iminoacyl Alkyl Complexes of Zirconium Supported by a Ferrocene-Linked Diphosphinoamide Ligand Scaffold

2016 ◽  
Vol 69 (5) ◽  
pp. 555 ◽  
Author(s):  
Nathan R. Halcovitch ◽  
Michael D. Fryzuk
Keyword(s):  
General Formula ◽  
Mechanistic Studies ◽  
Hydrogen Shift ◽  
Alkyl Complexes ◽  
Rate Determining Step ◽  
Zirconium Complexes ◽  
Alkyl Derivatives ◽  
Benzyl Substituent

Zirconium dialkyl complexes of the general formula fc(NPiPr2)2ZrR2 (where fc = 1,1′-ferrocenyl, R = CH3, CH2Ph, CH2tBu, tBu) have been synthesized and characterized via the addition of alkyl lithium or potassium benzyl derivatives to the dichloride complex fc(NPiPr2)2ZrCl2(THF). Addition of 2,6-dimethylphenylisocyanide to these alkyl derivatives generates the corresponding mono iminoacyl alkyl zirconium complexes. On thermolysis, the iminoacyl moiety containing a benzyl substituent undergoes rearrangement to yield a new complex that contains an alkene-amido fragment. Mechanistic studies point to a 1,2 hydrogen shift as the rate-determining step.

scholarly journals 3-Benzyl-5,5-diphenylimidazolidine-2,4-dione

IUCrData ◽  
2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Walid Guerrab ◽  
Rachida Akrad ◽  
Mhammed Ansar ◽  
Jamal Taoufik ◽  
Joel T. Mague ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules ◽  
Corrugated Sheets ◽  
Benzyl Substituent

The asymmetric unit of the title compound, C22H18N2O2, consists of two independent molecules differing primarily in the orientation of the benzyl substituent. The two independent molecules are associated through complementary C—H...π interactions and are elaborated into corrugated sheets by paired N—H...O and C—H...O hydrogen bonds. Additional C—H...O hydrogen bonds bind the sheets together.

Chloride Salts of Triethyl- and Benzyl-Triethyl-Ammonium: A New Antifungal for Giant Bamboo (Dendrocalamus asper) Preservation

2021 ◽  
Vol 1162 ◽  
pp. 35-40
Author(s):  
Ahmad Mudzakir ◽  
Soja Siti Fatimah ◽  
Yayan Sanjaya ◽  
Budiman Anwar ◽  
Gumilar Miftahurrahman
Keyword(s):  
Fungicidal Activity ◽  
Agar Plate ◽  
Chloride Anion ◽  
Ammonium Salts ◽  
Plate Method ◽  
Dendrocalamus Asper ◽  
Chloride Salts ◽  
Benzyltriethylammonium Chloride ◽  
Lethal Doses ◽  
Benzyl Substituent

In this study, quarternary ammonium salts based on triethylammonium and benzyltriethylammonium cations with the anion of chloride are successfully used for giant bamboo (Dendrocalamus Asper) preservation. These salts are new biocides as well as new salts which penetrate bamboo well. The prepared salts with hydrogen and benzyl substituent at the cation and consisted of chloride anion, exhibited fungicidal activity against Aspergillus Flavus. The effective and lethal doses were measured by the agar-plate method. In their activity against bamboo degrading fungi, salt of benzyl-triethyl-ammonium chloride was comparable with commercially available benzalkonium chloride and didecyldimethylammonium. Keywords: Triethylammonium, Benzyltriethylammonium, chloride, antifungal, and giant bamboo (Dendrocalamus Asper) and Aspergillus Flavus

scholarly journals A cinnamaldehyde Schiff base ofS-(4-methylbenzyl) dithiocarbazate: crystal structure, Hirshfeld surface analysis and computational study

2017 ◽  
Vol 73 (4) ◽  
pp. 543-549 ◽  
Author(s):  
Enis Nadia Md Yusof ◽  
Mohamed I. M. Tahir ◽  
Thahira B. S. A. Ravoof ◽  
Sang Loon Tan ◽  
Edward R. T. Tiekink
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Surface Analysis ◽  
Mirror Symmetry ◽  
Computational Study ◽  
Three Dimensional ◽  
Hirshfeld Surface ◽  
Hirshfeld Surface Analysis ◽  
Hydrogen Atoms ◽  
Benzyl Substituent

The title dithiocarbazate ester (I), C18H18N2S2[systematic name: (E)-4-methylbenzyl 2-[(E)-3-phenylallylidene]hydrazinecarbodithioate, comprises an almost planar central CN2S2residue [r.m.s. deviation = 0.0131 Å]. The methylene(tolyl-4) group forms a dihedral angle of 72.25 (4)° with the best plane through the remaining non-hydrogen atoms [r.m.s. deviation = 0.0586 Å] so the molecule approximates mirror symmetry with the 4-tolyl group bisected by the plane. The configuration about both double bonds in the N—N=C—C=C chain isE; the chain has an alltransconformation. In the crystal, eight-membered centrosymmetric thioamide synthons, {...HNCS}2, are formedviaN—H...S(thione) hydrogen bonds. Connections between the dimersviaC—H...π interactions lead to a three-dimensional architecture. A Hirshfeld surface analysis shows that (I) possesses an interaction profile similar to that of a closely related analogue with anS-bound benzyl substituent, (II). Computational chemistry indicates the dimeric species of (II) connectedviaN—H...S hydrogen bonds is about 0.94 kcal mol−1more stable than that in (I).

Ferrier–Nicholas pyranosidic cations: application to diversity-oriented synthesis

2014 ◽  
Vol 86 (9) ◽  
pp. 1357-1364 ◽  
Author(s):  
J. Cristobal Lopez ◽  
Fernando Lobo ◽  
Silvia Miranda ◽  
Clara Uriel ◽  
Ana M. Gomez
Keyword(s):  
Hydride Transfer ◽  
Pivotal Role ◽  
Diversity Oriented Synthesis ◽  
Ring Contraction ◽  
Transfer Step ◽  
Silyl Derivatives ◽  
Dicobalt Hexacarbonyl ◽  
Benzyl Substituent

AbstractPyranosidic allylic (Ferrier) cations that share dicobalt hexacarbonyl propargyl (Nicholas) stabilization at C-1, can be easily generated by treatment of hexacarbonyldicobalt alkynyl glycals with BF3·OEt2, and display a remarkable reactivity leading to a variety of products. The substituent at O-6 in these glycals plays a pivotal role in directing the outcome of the transformations. Accordingly, 6-O-benzyl or 6-O-allyl groups cause a series of transformations resulting in the stereoselective formation of oxepanes through a process that involves an initial hydride transfer step from the allyl or benzyl substituent to the Ferrier–Nicholas cation. On the contrary, 6-OH derivatives undergo an overall ring contraction to branched tetrahydrofuran derivatives. 6-O-Silyl derivatives, in the presence of heteroaryl nucleophiles, were transformed into C-3 branched bis-C-C-glycosides, containing two of such molecules.

Rotating Benzyl Substituent inansa-Bis(indenyl)zirconocenes Controls Propene Polymerization

2010 ◽  
Vol 29 (18) ◽  
pp. 4018-4024 ◽  
Author(s):  
Arto Puranen ◽  
Mikko Linnolahti ◽  
Tanja Piel ◽  
Pertti Elo ◽  
Ilpo Mutikainen ◽  
...  
Keyword(s):  
Propene Polymerization ◽  
Benzyl Substituent

Synthesis and Catalytic Activity of Spaced Ferrocene Oxazolines

2003 ◽  
Vol 68 (7) ◽  
pp. 1206-1232 ◽  
Author(s):  
Petr Štěpnička ◽  
Tomáš Baše ◽  
Ivana Císařová ◽  
Jiří Kubišta ◽  
Štěpán Vyskočil ◽  
...  
Keyword(s):  
Phenyl Group ◽  
Asymmetric Induction ◽  
Chiral Auxiliaries ◽  
X Ray Diffraction ◽  
Substituted Anilines ◽  
Standard Methods ◽  
X Ray ◽  
Nitrogen Donor ◽  
Solid State Structures ◽  
Benzyl Substituent

Chiral 2-[{N-aryl-N-(ferrocenylmethyl)amino}methyl]-4-(1-methylethyl)-4,5-dihydroxazoles with various substituents at the aryl ring were prepared by alkylation of N-(ferrocenylmethyl)anilines, FcCH2NHC6H4R (Fc = ferrocenyl), with (S)-2-(chloromethyl)-4-(1-methylethyl)-4,5-dihydrooxazole. The oxazoles, substituted anilines, and the precursors of the latter, the respective Schiff bases FcCH=NC6H4R, were characterized by standard methods and further studied by mass spectrometry. The oxazoles were further tested as chiral auxiliaries in the addition of diethylzinc to benzaldehyde but showed only negligible asymmetric induction (ee ca 10%), most likely due to steric hindrance of the nitrogen donor centres. This steric restriction seems to be lowered upon replacement of the substituted phenyl group with a benzyl substituent; compounds FcCH2NHCH2Ph and (R)-FcCH2NHCH(Me)Ph are easily alkylated yielding [FcCH2NMe2(CH2Ph)]I (9) and 2-[{N-(1-phenylethyl)-N-(ferrocenylmethyl)amino}methyl]-4-(1-methylethyl)-4,5-dihydroxazole (10), respectively. Solid-state structures of FcCH2NHC6H4R (R = 2-Me and 4-Cl), 9, and 10 have been determined by single-crystal X-ray diffraction.

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