Original syntheses of carbonyl compounds and gem-dihalocyclopropanes from β-hydroxyalkylselenides
作者:A. Krief、J.L. Laboureur、W. Dumont
DOI:10.1016/s0040-4039(01)81039-x
日期:1987.1
β-hydroxyalkylselenides possessing two alkyl substituents on the carbon bearing the selenenyl moiety react with dihalocarbenes generated from haloforms and thallous ethoxide or under phase transfer catalysis to produce ring enlarged ketones as the sole product in the first case, as the main product in the second. The reaction takes another course when the dihalocarbenes generated from haloforms and
Chemical consequences of conformation in macrocyclic compounds
作者:W.Clark Still、Igor Galynker
DOI:10.1016/s0040-4020(01)93273-9
日期:——
In this paper we show that the conformational properties of medium- and large-ring organic molecules have profound consequences on the stereochemical course of their chemical reactions. Kinetic enolate alkylations, dimethylcuprate additions and catalytic hydrogenations were examined on a variety of monosubstituted 8- to 12-membered macrocyclic ketones and lactones, and the diastereomeric composition
Cyclization and disproportionation kinetics of triplet generated, medium chain length, localized biradicals measured by time-resolved CIDNP
作者:Gerhard L. Closs、O. David Redwine
DOI:10.1021/ja00301a028
日期:1985.7
Cinetique de formation de cyclanones et des produits de dismutation a partir de diradicaux oxo-1 polymethylenes
Cinetique de Formation de cyclones et des produits de dismutation a partir de diradicaux oxo-1 polymethylenes
Ternäre, thermoplastische Mischungen
申请人:BAYER AG
公开号:EP0415066A2
公开(公告)日:1991-03-06
Gegenstand der vorliegenden Anmeldung sind ternäre, thermoplastische Mischungen aus Polycarbonaten, Polyurethanen und Pfropfpolymerisaten sowie gegebenenfalls üblichen Additiven und Verfahren zur Herstellung dieser Mischungen.
Gegenstand der Erfindung sind Copolyamide mit erhöhter Glasübergangstemperatur, die 3-30 Gew.-% an Polyamideinheiten auf Basis von Dicarbonsäuren und/oder Diaminen bestimmter cycloaliphatischer Bisphenole der Formel I enthalten
(Substituenten siehe Beschreibung)
本发明涉及玻璃化转变温度较高的共聚多酰胺,按重量计,该共聚多酰胺含有 3-30%的以二羧酸和/或式 I 中某些环脂族双酚的二胺为基础的聚酰胺单元。
(取代基见说明)