Selective N-Alkylation of Amines with Alcohols by Using Non-Metal-Based Acid-Base Cooperative Catalysis
作者:Ya Du、Shunsuke Oishi、Susumu Saito
DOI:10.1002/chem.201102446
日期:2011.10.24
straightforward method for the selective N‐mono‐ and dialkylation of amines with alcohols by means of non‐metal‐based catalysis promoted by TAPC is reported (see scheme). Selectivity of the N‐mono‐ and dialkylation, substrate scope and functional‐group tolerance are highlighted with respect to each amine (1° and 2°; aromatic and aliphatic) and alcohol (1°, 2° and 3°; benzylic and aliphatic) component.
IN-SITU POLYPHOSPHAZENE GENERATION IN CEMENT FOR IMPROVED ELASTIC PROPERTIES
申请人:ARAMCO SERVICES COMPANY
公开号:US20220212989A1
公开(公告)日:2022-07-07
A composition of matter may include a cement precursor, a phosphazene oligomer and water. A method may include blending a phosphazene oligomer and a cement precursor to form a cement precursor mixture. The method may then include introducing water into the cement precursor mixture to form the cement slurry. A composition of matter may include a cured cement matrix having a polyphosphazene polymer distributed throughout the cement matrix. A method may include cementing a wellbore by introducing a cement slurry into a wellbore, where the cement slurry includes a phosphazene oligomer. The method then includes maintaining the cement slurry such that a cured cement sheath forms, the cement sheath having a polyphosphazene polymer.