STEARIC ACID DERIVATIVES AND OLEIC ACID DERIVATIVES OF MULTI-ARM POLYETHYLENE GLYCOL
申请人:JENKEM TECHNOLOGY CO., LTD. (TIANJIN)
公开号:US20160272762A1
公开(公告)日:2016-09-22
Disclosed are multi-arm polyethylene glycol derivatives having structure of formula I or formula VI. Compared with straight chain polyethylene glycol, multi-arm polyethylene glycol has a plurality of terminal groups, thus has a plurality of introducing points of functional groups and can support a plurality of reactive terminal groups, thereby enabling multi-arm polyethylene glycol to have more flexibility and wider range of application.
US9890245B2
申请人:——
公开号:US9890245B2
公开(公告)日:2018-02-13
Unsymmetrical monoprotected α-diketones via the palladium-catalyzed vinylation of acid chlorides with organotin compounds
作者:John A. Soderquist、Wiilliam Wei-Hwa Leong
DOI:10.1016/s0040-4039(00)81925-5
日期:1983.1
Under benzyl(chloro) triphenylphosphinepalladium(II) catalysis, α-oxygenated vinyltin compounds undergo clean cross coupling with acidchlorides to give α-oxygenated enones which are converted to unsymmetrical α-diketones, butadienyl ethers or substituted methyl vinyl ketones.