(η6-[7]Heliphene)tricarbonylchromium via an Optimized Preparation of [7]Heliphene
摘要:
Optimized procedures to [7]heliphene are described that allowed the synthesis of ((6)-[7]heliphene)tricarbonylchromium and a preliminary exploration of its chemical behavior. DFT calculations provide structural and energetic information on this complex and its haptomeric isomers. Attempts to prepare the corresponding ([7]heliphene)chromium sandwich failed so far, but DFT evidence is presented to indicate that the target should be accessible.
Compositions of retinoids substituted with a dithiane ring, their use,
申请人:L'Oreal
公开号:US05296505A1
公开(公告)日:1994-03-22
The invention relates to a stereospecific derivative of formula: ##STR1## in which R is hydrogen or a C.sub.1 -C.sub.4 thioalkyl. The invention also relates to the use of these compounds for the manufacture of stereospecific retinal or retinoic acid, as well as to a process for preparing the retinoids of formula (I). The invention finally relates to a cosmetic or pharmaceutcial composition which contains at least one compound of formula (I) in a suitable vehicle; the pharmaceutical composition according to the invention may be used for treating dermatological, rheumatic, respiratory or ophthalmological conditions.
Glycosylated prodrugs, their method of preparation and their uses
申请人:Laboratoires Hoechst
公开号:US05561119A1
公开(公告)日:1996-10-01
Glycosylated prodrugs, a preparation method therefor, and their use with tumor-specific immunoenzymatic conjugates for the treatment of cancer, are described. These anthracycline prodrugs have formula (I). ##STR1##
Silyl derivatives of eugenol include compositions of the formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are independently selected from linear, branched, and cyclic hydrocarbon groups having a total of from one to about eight carbon atoms, except that where one of R.sup.1, R.sup.2 or R.sup.3 is a phenyl group, the total of carbon atoms must be at least nine. They may be made by silylating the corresponding hydroxyl compound. They are useful as comonomers for olefins to introduce functional sites and may be copolymerized in Ziegler-Natta catalyst systems.
Optimized procedures to [7]heliphene are described that allowed the synthesis of ((6)-[7]heliphene)tricarbonylchromium and a preliminary exploration of its chemical behavior. DFT calculations provide structural and energetic information on this complex and its haptomeric isomers. Attempts to prepare the corresponding ([7]heliphene)chromium sandwich failed so far, but DFT evidence is presented to indicate that the target should be accessible.