Propylene oxide end-capping route to primary hydroxyl group dominated CO2-polyol

Polymer ◽  
2018 ◽  
Vol 153 ◽  
pp. 167-172
Author(s):  
Shuangbin Fu ◽  
Yusheng Qin ◽  
Lijun Qiao ◽  
Xianhong Wang ◽  
Fosong Wang
Keyword(s):  
Propylene Oxide ◽  
Hydroxyl Group ◽  
Primary Hydroxyl ◽  
End Capping

Synthesis of Double Alkyl EO/PO Random Copolyethers with KOH Catalyst

2012 ◽  
Vol 472-475 ◽  
pp. 2681-2685
Author(s):  
Jian Guo Guo ◽  
Su Qin He ◽  
Jian Ming Jiang
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Propylene Oxide ◽  
Potassium Hydroxide ◽  
Random Copolymer ◽  
Alkyl Halides ◽  
Ethyl Bromide ◽  
Hydroxyl Group ◽  
Molar Ratio ◽  
End Capping

Ethylene oxide (EO) and propylene oxide (PO) random copolymer was synthesized with 1,2-propanediol as initiator, then the end-capping process was carried out by adding various alkyl halides and potassium hydroxide (KOH) to produce the double alkyl EO/PO random copolyethers. The factors effecting alkyl-capping rate were discussed. The results showed that when the molar ratio of hydroxyl group/KOH/1-bromobutane was 1/1.9/1.9, reacting time 6.5 hr and reacting temperature 50°C, the alkyl-capping rate could reach over 80%. The end-capping rate would also increase with the increasing content of ethylene oxide in the random polyether, and the end-capping rate of the EO/PO/EO block-polyether was high than that of the random polyether with same molecular weight. Instead of 1-bromobutane, ethyl bromide promised a higher whereas chloralkane gave a lower end-capping rate respectively.

LYCOCTONINE AND ITS OXIDATION PRODUCTS

1952 ◽  
Vol 30 (9) ◽  
pp. 627-645 ◽  
Author(s):  
O. E. Edwards ◽  
Léo Marion
Keyword(s):  
The Other ◽  
Oxidation Products ◽  
Hydroxyl Group ◽  
Ultraviolet Spectra ◽  
Primary Hydroxyl ◽  
Alkyl Groups ◽  
Methylene Group

The ultraviolet spectra, basic strengths, and N-alkyl groups of the aconite alkaloids are discussed. Pyropseudaconine has been shown to contain a conjugated system. The formulation C19H19–2,(OH)3,(OCH3)4NC2H5 has been confirmed for lycoctonine. Study of its oxidation products has shown that lycoctonine has a methylene group adjacent to the nitrogen and a primary hydroxyl group. The two remaining hydroxyls have been shown to be vicinal, with one probably secondary and the other tertiary. A carbinolamine structure is suggested for hydroxylycoctonine. The new bases, isolycoctonine, desoxylycoctonine, and des-(oxymethylene)-lycoctonine are described.

scholarly journals A Phosphonium Ylide as an Ionic Nucleophilic Catalyst for Primary Hydroxyl Group Selective Acylation of Diols

ACS Catalysis ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 6150-6154 ◽  
Author(s):  
Yasunori Toda ◽  
Tomoyuki Sakamoto ◽  
Yutaka Komiyama ◽  
Ayaka Kikuchi ◽  
Hiroyuki Suga
Keyword(s):  
Hydroxyl Group ◽  
Primary Hydroxyl ◽  
Selective Acylation

scholarly journals SYNTHESIS OF 1,2;3,4-DI-O-ISOPROPYLIDENE-6- O-[4-(1H-AZOL-1-YLMETHYL) PHENYL]- ¯-D-GALACTOPYRANOSE AND 1,2,3,4-TETRA-O-ACETYL-6- O-[4-(1H-AZOL-1- YLMETHYL)PHENYL]-¯-D-GLUCOPYRANOSE

2017 ◽  
Vol 17 (5) ◽  
pp. 122-128
Author(s):  
Z.P. Belousova ◽  
P.P. Purygin ◽  
A.P. Tyurin
Keyword(s):  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Secondary Hydroxyl ◽  
Primary Hydroxyl ◽  
Derivatives Of

Derivatives of D-galactose and D-glucose substituted for the primary hydroxyl group, which contain an aglycone azolylmethylphenyl fragments (for imidazole, 1,2,4-triazole, benzimidazole and benzotriazole) has been synthesized. Toprotect the secondary hydroxyl groups of monosaccharides acetyl and isopropylidene groups were used.

ChemInform Abstract: Synthesis of Aralkyl Peroxides with a Primary Hydroxyl Group.

ChemInform ◽  
1987 ◽  
Vol 18 (11) ◽  
Author(s):  
O. I. GEVUS' ◽  
M. A. DIKII ◽  
V. A. PUCHIN
Keyword(s):  
Hydroxyl Group ◽  
Primary Hydroxyl

New 3-O-Lauroyl-2-O-Benzyl-Glycerol Sulfonate

2007 ◽  
Vol 2007 (9) ◽  
pp. 503-505
Author(s):  
Liang Han ◽  
Zheng-Ming Li ◽  
Jian-Rong Gao
Keyword(s):  
Fungicidal Activity ◽  
Hydroxyl Group ◽  
Primary Hydroxyl ◽  
Hydroxy Groups

The hydroxy groups of D-mannitol were protected by the formation of acetals and benzylethers and then 2-O-benzyl-D-glyceraldehyde dimethylacetal was prepared after the deprotection and oxygenolysis of the protected D-mannitol. In the presence of DCC and DMAP, the lauroyl group was introduced at the primary hydroxyl group of the dimethylacetal and 3-O-lauroyl-2-O-benzyl-glycerol was obtained after the deprotection of the dimethylacetal with FeCl3·6H2O and then reduction with NaBH4. A series of new 3-O-lauroyl-2-O-benzyl-glycerol sulfonates was synthesised by the coupling of different sulfonyl groups with the 3-O-lauroyl-2-O-benzyl- glycerol. The bioactivities of the title compounds were tested and some compounds exhibited fungicidal activity against the tested fungi.

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