Novel phosphate anthelmintics. 3. Alkyl and aryl 1-methyleneallyl phosphates, phosphonates, and phosphinates
作者:Kurt Pilgram、D. Kendall Hass
DOI:10.1021/jm00246a007
日期:1975.12
chlorinated 1-methyleneallyl ("butadienyl") dialkyl phosphates and related phosphonates and phosphinates has been synthesized and assessed for anthelmintic activity in mice against the tapeworm Hymenolepis nana and the pinworm Syphacia obvelata. Highest activity was observed with diethyl 2,3,3-trichloro-1-dichloromethyleneallyl ("perchlorobutadienyl") phosphate (14), while replacement of both ethoxy groups
Polychlorinated ketones. III. Formation by acid-catalyzed cleavage of vinyl phosphates and phosphonates
作者:Kurt Pilgram、Franz Goergen、Helmut Ohse
DOI:10.1021/jo01263a072
日期:1969.11
Roedig; Becker, Justus Liebigs Annalen der Chemie, 1955, vol. 597, p. 214,224
作者:Roedig、Becker
DOI:——
日期:——
Sex and Age Effects on Willingness to Communicate, Anxiety, Perceived Competence, and L2 Motivation Among Junior High School French Immersion Students
作者:Peter D. MacIntyre、Susan C. Baker、Richard Clément、Leslie A. Donovan
DOI:10.1111/1467-9922.00194
日期:2002.9
The present study involves a cross–sectional investigation of second–language (L2) communication among students in a junior high French late immersion program. The effects of language, sex, and grade on willingness to communicate (WTC), anxiety, and perceived communication competence, on frequency of communication in French, and on the attitude and motivation variables are examined globally and at each grade level. It was found that students’ L2 WTC, perceived competence, and frequency of communication in French increased from grades 7 to 8 and was maintained between grades 8 and 9, despite a drop in motivation between grades 7 and 8 and a steady level of anxiety across the three grades.