In a recent publication C. A. Nicolaides and Y. Komninos, Int. J. Quant. ## Ε½ .x Chem. 67, 321 1998 , we proposed that in certain classes of molecules the fundamental reason for the formation of covalent polyatomic molecules in their normal shape is to be Ε½ . found in the existence of a geometric
The molecular shape of calciferol and related substances
β Scribed by Bernal, J. D. ;Crowfoot, D.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1935
- Weight
- 196 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0368-4075
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β¦ Synopsis
our originiil study of ergosterol iind its irriidiatiou products,' tlic most notiiblc fact was tlic closc siiiiilarity of crystill structurc of tlic diffcrcut coinpoiiiiils.
A11 tlic conipoiinils esccpt suprasterol 11 crystiilliscd in fliit IiccdIcs, ino~iocli~iic, with b as thc long iisis, und 11 c direction niorc or less iiicliiied to the pcrpcndiculur to the main fucc. Tlic sliapcs of tlic cclls arc also siniihr, uiid tiic infcrcncc driiw~i a t that tiiiic wiis that, wliiitcvcr thc molcculiir striicture of tlic coinpouIids, they a11 Iiud upprosiiiiutcly tlie same , l
Crystallographic Lnborntory
Ciiiiibritlgc
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## Abstract The characteristic fragment of trimethylsilylated pantothenic acid (TMSβPA) at __m__/__z__ 291 upon electron ionization was shown to originate from the molecular ion by a McLafferty rearrangement instead of by ejection of 1,1,3,3βtetramethylβ1,3βdisilacyclobutane. The verification consi