One-Pot, Three-Component Synthesis of 4-Aryl-5,6-dihydropyran via Prins-Friedel-Crafts Reaction
作者:Anil Saikia、Udagandla Reddy
DOI:10.1055/s-0029-1219779
日期:2010.4
An efficient method for the synthesis of 4-aryldihydropyrans has been developed from the reaction of aldehydes or epoxides with homopropargylic alcohols in the presence of arenes promoted by borontrifluoride etherate.
The present invention relates to novel compositions, comprising a repellent and an additive, where the additive is selected from the group consisting of phenol, benzaldehyde, benzoic acid or derivatives thereof and is present in a ratio of from 10:100 to 200:100% by weight to the repellent, and to their use for repelling crawling harmful insects, in particular ants or cockroaches.
ZUSAMMENSETZUNGEN ZUR ABSCHRECKUNG KRIECHENDER INSEKTEN
申请人:Bayer Aktiengesellschaft
公开号:EP1304924A2
公开(公告)日:2003-05-02
[DE] ZUSAMMENSETZUNGEN ZUR ABSCHRECKUNG KRIECHENDER INSEKTEN<br/>[EN] COMPOSITIONS FOR REPELLING CRAWLING INSECTS<br/>[FR] COMPOSITIONS DESTINEES A ELOIGNER DES INSECTES RAMPANTS
申请人:BAYER AG
公开号:WO2002005646A2
公开(公告)日:2002-01-24
Die vorliegende Erfindung betrifft neue Zusammensetzungen, umfassend ein Repellent und ein Additiv, wobei das Additiv aus der Gruppe, bestehend aus Phenol, Benzaldehyd, Benzoesäure oder Derivaten davon, ausgewählt und in einem Verhältnis von 10:100 bis 200:100 Gew.-% zum Repellent vorhanden ist, sowie deren Verwendung zur Abschreckung kriechender Schadinsekten, insbesondere von Ameisen oder Schaben.
Titanium tetrafluoride: An efficient Lewis acid and fluorinating agent for stereoselective synthesis of 4-fluorotetrahydropyran
作者:S. Bondalapati、U.C. Reddy、D.S. Kundu、Anil K. Saikia
DOI:10.1016/j.jfluchem.2009.11.002
日期:2010.3
Titanium tetrafluoride can efficiently be used for strereoselective synthesis of 4-fluorotetrahydropyrans via Prins cyclization in good yields. The method is general and can be used for aldehydes as well as ketones.