Retinol analogues. Part I. Synthesis of acyclic analogues of retinoic acid
作者:O. P. H. Augustyn、P. de Wet、C. F. Garbers、L. C. F. Lourens、E. Neuland、D. F. Schneider、K. Steyn
DOI:10.1039/j39710001878
日期:——
Various C19 analogues of retinoicacid have been prepared from isopropyl t-butyl ketone. Potassium hydrogen sulphate in dimethyl sulphoxide proved an effective reagent for the elimination of water from intermediate hydroxyderivatives, but dehydration of 9-hydroxy-6,10-dimethyl-9-t-butylundeca-3,5,7-trien-2-one yielded 2-methyl-5-(4-isopropyl-1,5,5-trimethylhexa-1,3-dienyl)furan and 9-isopropyl-6,9
Cyanotrimethylsilane adds to some ⇌,β-unsaturated ketones in conjugate manner under the catalytic action of Lewis acids such as triethylaluminium, aluminiumchloride, and SnCl2. Hydrolysis of the products gives β-cyano ketones which are identical to the hydrocyanated products of the starting enones. The title silicon reagent reacts with acetals and orthoesters under the catalytic action of SnCI2 or BF3-OEt2
RUTHENIUM COMPLEX, PROCESS FOR PRODUCING THE SAME AND PROCESS FOR PRODUCING THIN FILM
申请人:TOSOH CORPORATION
公开号:US20030088116A1
公开(公告)日:2003-05-08
A ruthenium-containing thin film is produced by the chemical vapor deposition method etc. with the use of an organometallic ruthenium compound represented by the general formula (1), specific example of which is (2,4-dimethyl-pentadienyl)(ethylcyclopentadienyl) ruthenium:
1
or an organometallic ruthenium compound represented by the general formula (7), specific example of which is carbonylbis(2-methyl-1,3-pentadiene) ruthenium:
2
as the precursor.
Depending on the steric hindrance of the reaction centers, hemiacetal vinylogs 1 in the presence of BF3.OEt2 can, with enol ethers, lead to a Michael-typeaddition (4) or an aldolisation-type reaction (3). Hemiacetal vinylog 1b always yields the second reaction leading to β-methoxy-γ,δ-ethylenic carbonyl compounds 4 precursors of polyenic carbonyl compounds 5. Crotonaldehyde and methanol can be used
Diastereoselective addition reactions to carbonyl groups in the side-chain of π-allytricarbonyliron lactone complexes
作者:Steven V. Ley、Graham Meek、Karl-Heinz Metten、Carmen Pique
DOI:10.1039/c39940001931
日期:——
Organoaluminium reagents add in a highly diastereoselective fashion to carbonyl groups adjacent to the allyl system of Ï-allyltricarbonyliron lactone complexes.