Catalytic Asymmetric Cyclocarbonylation of <i>o</i>-Isopropenylphenols: Enantioselective Synthesis of Six-Membered Ring Lactones
作者:Chune Dong、Howard Alper
DOI:10.1021/jo040109f
日期:2004.7.1
Cyclocarbonylation of o-isopropenylphenols with CO (500 psi) and H2 (100 psi), using Pd(OAc)2 and (+)-DIOP as the chiral catalyst, in CH2Cl2 affords 3,4-dihydro-4-methylcoumarins in 60−85% yield and in up to 90% enantiomeric excess. The stereoselectivity is influenced by the structure of the chiral phosphine ligands and substrates, as well as by the reaction conditions.
Synthesis of Coumarins via Pd-Catalyzed Oxidative Cyclocarbonylation of 2-Vinylphenols
作者:Jamie Ferguson、Fanlong Zeng、Howard Alper
DOI:10.1021/ol302725x
日期:2012.11.2
Palladium-catalyzed oxidative cyclocarbonylation of 2-vinylphenols constitutes a simple, direct method for the synthesis of coumarins. The reaction conditions, employing low pressures of CO, and air or 1,4- benzoquinone as the oxidant, are attractive in terms of environmental considerations and operational simplicity. Coumarins with a variety of functional groups were prepared in yields up to 85%.
Preissecker, Monatshefte fur Chemie, 1914, vol. 35, p. 891
作者:Preissecker
DOI:——
日期:——
US9568763B2
申请人:——
公开号:US9568763B2
公开(公告)日:2017-02-14
[EN] PHOTOCHROMIC OPTICAL ARTICLES PREPARED WITH REVERSIBLE THERMOCHROMIC MATERIALS<br/>[FR] ARTICLES OPTIQUES PHOTOCHROMIQUES PRÉPARÉS AVEC DES MATÉRIAUX THERMOCHROMIQUES RÉVERSIBLES
申请人:TRANSITIONS OPTICAL INC
公开号:WO2010074969A1
公开(公告)日:2010-07-01
Provided is a photochromic optical articleincluding: (a) an optical substrate; (b) a thermally reversible photochromic material; and (c) reversible thermochromic material capable of at least partially filtering UV/visible light at or below room temperature and becoming less capable of filtering UV/visible light at temperatures greater than room temperature.