This invention relates to crystals of compounds of formula (I), wherein TBS represents t-butyldimethylsilyl, and Ph represents phenyl, or its salt or solvate. Compounds of formula (I) are synthesis intermediates of 2-substituted-1β-methyl carbapenem compounds useful as antimicrobial agents. The crystals of the present invention have excellent handleability and can realize the production of carbapenem compounds having excellent antimicrobial actibity in a simpler manner with improved yield and purity.
UV ABSORBING DENTRITIC POLYETHER PREPARED BY POLYMERIZATION OF OXETANES
申请人:DSM IP Assets B.V.
公开号:EP2510041A1
公开(公告)日:2012-10-17
US7482445B2
申请人:——
公开号:US7482445B2
公开(公告)日:2009-01-27
[EN] UV ABSORBING DENTRITIC POLYETHER PREPARED BY POLYMERIZATION OF OXETANES<br/>[FR] POLYÉTHER DENDRITIQUE ABSORBANT LES UV PRÉPARÉ PAR POLYMÉRISATION D'OXÉTANES
申请人:DSM IP ASSETS BV
公开号:WO2011070050A1
公开(公告)日:2011-06-16
The present invention relates to a polymer comprising a hyperbranched dendritic polyether backbone covalently bonded via an oxygen bridge to at least one UV absorbing chromophore characterized in that the hyperbranched dendritic polyether backbone is obtainable by a ring-opening polymerization of at least one oxetane. Such polymers are particularly useful as UV-filter substances for example in compositions for the protection of the human skin and/or hair against harmful effects of sunlight.