Reactions of (phosphine)pentacarbonyltungsten. Synthesis of primary and secondary phosphines in the coordination sphere of tungsten
作者:Françoi Nief、François Mercier、François Mathey
DOI:10.1016/0022-328x(87)80251-6
日期:1987.7
A new preparation of W(CO)5(PH3) (1) in fair yield on a multigram scale has been devised. 1 is metalated by one equivalent of n-BuLi to give W(CO)5 (PH2Li) (2), which reacts with various electrophiles: with alkyl halides W(CO)5(PH2R) complexes are obtained, but with other electrophiles the species W(CO)5(PHR2) is also obtained along with 1. Disubstituted complexes can also be obtained when 1 is treated
Process for preparation of terpene flavorants and novel intermediates
申请人:Givaudan Corporation
公开号:US03950430A1
公开(公告)日:1976-04-13
A process for preparing compounds of the type of sinensal, which is suitable as a flavor-imparting agent of orange aroma, and novel intermediates including those having the general formula: ##SPC1## Wherein R signifies a CH.sub.2 OH, CHO or COOH group and the broken lines present a double bond emanating from C-atom 4, are disclosed.
Process for the preparation of unsaturated aldehydes
申请人:Firmenich S.A.
公开号:US03979425A1
公开(公告)日:1976-09-07
The present invention relates to a novel process for preparing unsaturated aldehydes comprising four double bonds of formula ##SPC1## Wherein one of the double bonds is represented by the dotted lines. Aldehyde Ia (called .alpha.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the main carbon chain. Aldehyde Ib (called .beta.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the side chain. The invention also relates to new intermediates used in the said new process and to methods for preparing them. The said intermediates have also valuable organoleptic properties and are useful as fragrances in the preparation of perfumes, perfumed products and artificial essential oils.
A process for preparing compounds of the type of sinensal, which is suitable as a flavor-imparting agent of orange aroma, and novel intermediates including those having the general formula: ##SPC1## Wherein R signifies a CH.sub.2 OH, CHO or COOH group and the broken lines present a double bond emanating from C-atom 4, are disclosed.
The present invention relates to a novel process for preparing unsaturated aldehydes comprising four double bonds of formula ##SPC1## Wherein one of the double bonds is represented by the dotted lines. Aldehyde Ia (called .alpha.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the main carbon chain. Aldehyde Ib (called .beta.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the side chain. The invention also relates to new intermediates used in the said new process and to methods for preparing them. The said intermediates have also valuable organoleptic properties and are useful as fragrances in the preparation of perfumes, perfumed products and artificial essential oils.