ChemInform Abstract: Monomeric Formaldehyde in Ethereal Solution.

ChemInform ◽  
2010 ◽  
Vol 22 (13) ◽  
pp. no-no
Author(s):  
M. SCHLOSSER ◽  
T. JENNY ◽  
Y. GUGGISBERG
Keyword(s):  
Ethereal Solution

scholarly journals The distillation of vitamin D

1930 ◽  
Vol 107 (748) ◽  
pp. 76-90 ◽  
Keyword(s):  
Vitamin D ◽  
Vacuum Distillation ◽  
Complex Mixture ◽  
Ultra Violet ◽  
Mercury Vapour ◽  
Silica Tube ◽  
Ethereal Solution ◽  
Mercury Vapour Lamp

The work described below has been done in an attempt to isolate vitamin D from the complex mixture formed by the ultra-violet irradiation of ergosterol. It is evident that vacuum distillation might be of use for this purpose, but, except for a brief statement by Windaus and Holtz (1927), we are unaware of previous work on the distillation of vitamin D. We have distilled various products obtained from ergosterol, and most frequently have used resinous products prepared as follows. A solution of ergosterol in ether was exposed to the unfiltered radiation from a mercury vapour lamp while flowing through a narrow silica tube at a rate such tat about 40 per cent. of the ergosterol was destroyed. Thy unchanged ergosterol was then removed by precipitation with digitonin as described in a previous paper (Webster and Bourdillon, 1928) and the ethereal solution of the products of radiation was evaporated in vacuo to a dry resin.

Organoaluminium compounds. VII. The reactions of organoaluminium compounds with phenylacetylene

1964 ◽  
Vol 17 (11) ◽  
pp. 1229 ◽  
Author(s):  
T Mole ◽  
JR Surtees
Keyword(s):  
Triple Bond ◽  
Side Reaction ◽  
Similar Process ◽  
Side Reactions ◽  
Crystalline Solids ◽  
Ethereal Solution ◽  
Presence And Absence

The reactions of trimethyl-, triethyl-, tripropyl-, tri-isobutyl-, and triphenylaluminium with phenylacetylene in the presence and absence of benzene or toluene have been studied. In every case phenylethynylaluminium compounds are formed. Dimethyl(phenylethynyl)aluminium and diphenyl(phenylethynyl)aluminium are crystalline solids. The former compound disproportionates partially in ethereal solution. Side reactions competing with the formation of phenylethynylaluminium compounds are also observed. Triethylaluminium and tripropylaluminium add to phenylacetylene to give PhC(AlR2)=CHR (R = Et, Pr), but these alkenylaluminium compounds metallate further phenylacetylene and are so transformed to alkenes. A similar process occurs in the reaction with triphenylaluminium, but in this case both possible products of cis addition are observed. Tri-isobutylaluminium yields phenylethenyl compounds by reduction of the triple bond in the principal side reaction.

Das Anion [R2Al-AlR2Br]- (R = CH(SiMe3)2) mit Aluminium-Aluminium- und terminaler Aluminium-Brom-Bindung / The Anion [R2Al-AlR2Br]- (R = CH(SiMe3)2) with an Aluminium -Aluminium and a Terminal Aluminium -Bromine Bond

1994 ◽  
Vol 49 (5) ◽  
pp. 637-641 ◽  
Author(s):  
Werner Uhl ◽  
Uwe Schütz ◽  
Siegfried Pohl ◽  
Wolfgang Saak
Keyword(s):  
Crystal Structure ◽  
Bond Length ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Aluminium Atom ◽  
Ethereal Solution ◽  
Quantitative Formation ◽  
Starting Compound

Tetrakis[bis(trimethylsilyl)methyl]dialane(4) (1) with an Al-Al bond reacts with LiBr in n-pentane in the presence of chelating N.N.N'.N'-tetramethylethylenediamine (TMEDA) to yield the monobromo adduct [Li(TMEDA)2]+[R2Al-AlR2Br]- 4. Compound 4 is unstable in ethereal solution and decomposes with quantitative formation of LiBr and the starting compound 1. Crystal structure determination of 4 C5H10 shows a terminal Al-Br bond in an anion with a four-coordinated aluminium atom neighbouring a three-coordinated, coordinatively unsaturated aluminium atom. While the Al-Al bond length is not significantly different (264.3 pm) as compared to the data for 1, the Al-Br bond is rather long (247.6 pm) indicating a weak coordinative bonding.

An Improved Route to Purin-6-yl Magnesium Halides by Metal–Halogen Exchange in Dichloromethane

Synlett ◽  
2017 ◽  
Vol 29 (04) ◽  
pp. 473-476 ◽  
Author(s):  
Stephen Lindell ◽  
Malcolm Gordon ◽  
Daniel Richards
Keyword(s):  
Ambient Temperature ◽  
Ethylmagnesium Bromide ◽  
Ethereal Solution ◽  
Halogen Exchange

Treatment of a solution of 9-benzyl or 9-phenyl 6-iodopurine in dichloromethane with an ethereal solution of ethylmagnesium bromide at ambient temperature generates the corresponding purin-6-yl magnesium halides which react with aldehydes to give carbinols in 55–80% yield. Performing the same procedure with THF as solvent gave carbinols in much lower yields (≤15%).

General Route to Purin-2-ylmagnesium Halides by Metal–Halogen Exchange in Dichloromethane

Synlett ◽  
2020 ◽  
Vol 31 (05) ◽  
pp. 512-516
Author(s):  
Silvia Gazzola ◽  
Malcolm R. Gordon ◽  
Stephen D. Lindell
Keyword(s):  
Functional Group ◽  
Grignard Reagents ◽  
Ethylmagnesium Bromide ◽  
Ethereal Solution ◽  
Halogen Exchange ◽  
First Time

Treatment of a solution of a 9-alkyl- or 9-aryl-2-iodopurine in dichloromethane with an ethereal solution of ethylmagnesium bromide at –5 °C generates the corresponding purin-2-ylmagnesium bromide, which reacts with aldehydes to give the corresponding 2-(hydroxyalkyl)purines in yields of 53–84%. The purin-2-yl Grignard reagents show good functional-group tolerance to ester and nitro groups, and the method permits the synthesis of the previously unknown 6-unsubstituted 2-magnesiopurines for the first time. Performing the same procedure in THF as solvent resulted either in extensive decomposition or rapid isomerization to give purin-8-ylmagnesium halides.

Beiträge zur Chemie des Hydrazins und seiner Derivate, XXX / Über die Umsetzung von Hydrazin und 1.2-Dimethylhydrazin mit Dichlordisulfan / The Reaction of Hydrazine and 1,2-Dimethylhydrazine with Dichlorodisulfane

1971 ◽  
Vol 26 (12) ◽  
pp. 1207-1209 ◽  
Author(s):  
Herbert Lingmann ◽  
Karl-Heinz Linke
Keyword(s):  
Ethereal Solution ◽  
Sulfur Intermediates

Hydrazine in ethereal solution is oxidized to nitrogen by means of dichlorodisulfane, while the sulfane is reduced to sulfur. Intermediates of the oxidation of hydrazine could not be observed. By reaction of 1,2-dimethylhydrazine with dichlorodisulfane tetramethyl cyclotetrasulfurdihydrazide has been obtained.

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