Low or no chlorine content poly(aryloxyphosphazene) copolymers useful for fireproof foams are surprisingly produced in a one step process without use of excess phenoxide reactant over a shorter than conventional time period by (a) adding linear (NPCl2)n to a mixture of phenoxides comprising alkali or alkaline earth metal phenoxide, alkylphenoxide and allylphenoxide in quantities such that the total of the phenoxides is the equivalent of the total chlorine atoms in the (NPCl2)n and allylphenoxide is present in an amount equivalent to from about 2% to about 10% of the chlorine atoms in the (NPCl2)n; and (b) reacting the admixture formed in step (a) at a temperature ranging from about 280°F. to about 320°F. for a time period ranging from about 7 hours to about 10 hours.
van Hooidonk,C.; Ginjaar,L., Recueil des Travaux Chimiques des Pays-Bas, 1967, vol. 86, p. 449 - 457
作者:van Hooidonk,C.、Ginjaar,L.
DOI:——
日期:——
Carbon-13 nuclear magnetic resonance spectroscopy. Substituent-induced chemical shift effects on cyclopropyl carbons of 4-substituted cyclopropylbenzenes
作者:Yoshiaki Kusuyama、Christina Dyllick-Brenzinger、John D. Roberts
DOI:10.1002/mrc.1270130516
日期:1980.5
AbstractCarbon‐13 chemical shifts of the cyclopropyl carbons of eleven 4‐substituted cyclopropylbenzenes have been measured under conditions effectively corresponding to infinite dilution in DCCI3. The substituent‐induced chemical shifts (SCS) of both the α and β carbons of the cyclopropane ring were found to be downfield with electron‐attracting groups and upfield for electron‐donating groups. The trends for the β carbons correspond to those observed for the β carbons of 4‐substituted phenylethenes, while the trends of the α carbons are similar to those found for the α carbons of 4‐substituted isopropyl benzenes. The results for the β carbons can be rationalized by postulating a substantial contribution from a hyperconjugative resonance effect involving the σ system of the benzene ring (and its 4‐substituent) and the C‐α—Cβ bonds of the cyclopropane ring. The effects on the α carbons are in accord with a very reasonable smaller inductive polarization of the C‐αC‐β bonds than encountered for the carbons of corresponding ethenyl‐ or ethynylbenzenes.
Amino(hetero)arylmethylation of Phenols with <i>N</i>-[α-Amino(hetero)arylmethyl]benzotriazoles
作者:Alan R. Katritzky、Ashraf A. A. Abdel-Fattah、Dmytro O. Tymoshenko、Sergei A. Belyakov、Ion Ghiviriga、Peter J. Steel
DOI:10.1021/jo9903609
日期:1999.8.1
N-[alpha-Amino(hetero)arylmethyl]benzotriazole derived from a variety of (hetero)aromatic aldehydes were reacted with sodium phenolates to afford amino(hetero)arylmethylated phenols in high yields.