Herein, direct N,N-dialkylation of acylhydrazides using alcohols is reported. This catalytic protocol provides one-pot synthesis of both symmetrical and unsymmetrical N,N-disubstituted acylhydrazides using an assortment of primary and secondary alcohols with remarkable selectivity and excellent yields. Interestingly, the use of diols resulted in intermolecular cyclization of acylhydrazides, and such
MODIFIED NATURAL RUBBER, PROCESS FOR PRODUCTION OF THE SAME, AND RUBBER COMPOSITION AND TIRE EACH COMPRISING THE SAME
申请人:Bridgestone Corporation
公开号:EP2206730A1
公开(公告)日:2010-07-14
This invention provides a modified natural rubber producible at a lower cost than the conventional techniques and capable of improving the low loss factor, wear resistance and fracture characteristics of the rubber composition using the modified natural rubber as the rubber component in the rubber composition, and a method for producing the modified natural rubber. This invention provides a modified natural rubber formed by adding a hydrazide compound having a polar group to at least one natural rubber raw material selected from the group consisting of a natural rubber, a coagulated natural rubber latex and a natural rubber cup lump, a rubber composition using the modified natural rubber, and a tire using the rubber composition in any tire member.
Methods for the site-selective coupling of a first agent to a second agent
申请人:UNIVERSITEIT GENT
公开号:US11053279B2
公开(公告)日:2021-07-06
The present invention relates to a method for site-selective coupling of a first agent to a second agent, comprising the steps of: contacting a first agent comprising at least one furan moiety with an activation signal and with a second agent comprising at least one hydrazine moiety or at least one hydroxylamine moiety, thereby activating said furan moiety to an activated furan moiety; and reacting said activated furan moiety with the hydrazine moiety or the hydroxylamine moiety, thereby site-selectively coupling said first agent to said second agent.