Studies on aryl H-phosphonates. 3. Mechanistic investigations related to the disproportionation of diphenyl H-phosphonate under anhydrous basic conditions
anhydrous reaction conditions a base-promoted disproportionation to triphenylphosphite and phenyl H-phosphonate. On the basis of 31P NMR data the most likely mechanism for this transformation was proposed. In order to substantiate these findings and to get a deeper insight into the chemistry of aryl H-phosphonate esters, we carried out also some studies on activation of phenyl and diphenyl H-phosphonates
H-膦酸二苯酯在无水反应条件下发生碱促进的歧化成亚磷酸三苯酯和H-膦酸苯酯。根据31 P NMR数据,提出了这种转化的最可能机理。为了证实这些发现并更深入地了解芳基H-膦酸酯的化学性质,我们还进行了一些有关用各种缩合剂活化苯基和二苯基H-膦酸酯的研究。我们发现,膦酸的芳基对烷基酯通常在活化过程中遵循不同的反应途径,这很可能可以追溯到磷中心的较高亲电性和芳基H-膦酸酯衍生物中PH键的较高反应性。
High efficiency polyalkylene glycol lubricants for use in worm gears
申请人:Carey Thomas James
公开号:US20050181958A1
公开(公告)日:2005-08-18
A polyalkylene glycol based lubricant composition that contains specified rust inhibitors and antioxidants has lowered operating temperature and is particularly suitable for use in worm drive gearboxes. The rust inhibitors consist of an N-acylo arcosine and an imidizole while the antioxidant consists of an alkylated diphenyl amine and a hindered phenol.