Metalated carboxylic acids. IV. Reactions of metalated carboxylic acids with epoxides. Substituted steroidal spiro .gamma.-lactones from spiro .beta.-epoxides
作者:P. L. Creger
DOI:10.1021/jo00977a013
日期:1972.6
BIODEGRADABLE POLYURETHANE/UREA COMPOSITIONS
申请人:Adhikari Raju
公开号:US20130150964A1
公开(公告)日:2013-06-13
The present invention relates to biocompatible, biodegradable polyurethane/urea polymeric compositions that are capable of in-vivo curing with low heat generation to form materials suitable for use in scaffolds in tissue engineering applications such as bone and cartilage repair. The polymers are desirably flowable and injectable and can support living biological components to aid in the healing process. They may be cured ex-vivo for invasive surgical repair methods, or alternatively utilized for relatively non-invasive surgical repair methods such as by arthroscope. The invention also relates to prepolymers useful in the preparation of the polymeric compositions, and to methods of treatment of damaged tissue using the polymers of the invention.
US9084827B2
申请人:——
公开号:US9084827B2
公开(公告)日:2015-07-21
Catalytic Redox Chain Ring Opening of Lactones with Quinones To Synthesize Quinone-Containing Carboxylic Acids
作者:Xiao-Long Xu、Zhi Li
DOI:10.1021/acs.orglett.9b01672
日期:2019.7.5
Catalytic ringopening of five- to eight-membered lactones with quinones is achieved through a redox chain mechanism. With low loading of a simple metal triflate Lewis acid catalyst and a chain initiator, C–H bonds of many quinones were efficiently functionalized with carboxylic acid-containing side chains. This method also features 100% atom economy and wide substrate scope. A novel route to the anti-asthma