Improved Syntheses of 5‐Hydroxy‐2‐Pyridones (2,5‐Dihydroxypyridines)
摘要:
Improved syntheses of 5-hydroxy-2-pyridone, 6-chloro-5-hydroxy-2-pyridone, 2,4-dihydroxynicotinic acid, and three methyl-substituted 5-hydroxy-2-pyridones are reported.
IMPROVED OXIDATIVE HAIR DYES AND RELATED TOPICAL COMPOSITIONS
申请人:The Boots Company PLC
公开号:EP1865914A1
公开(公告)日:2007-12-19
Oxidative Hair Dyes and Related Topical Compositions
申请人:Forbes Neil Robert
公开号:US20080233068A1
公开(公告)日:2008-09-25
An oxidative hair dye system comprises a hair dye, an organometallic compound and an oxidising agent. The organometallic compound is preferably an organotitanate compound, particularly a tetraalkyl titanate or a titanate chelate. Such compounds are also useful for enhancing the substantivity of topical compositions applied to the body, which comprise one or more cosmetic and/or therapeutic benefit agents, a bonding agent having hydrolysable or exchangeable ligands, and a carrier.