## Abstract The reaction between electronβdeficient acetylenedicarboxylates (I), triethyl phosphite (II), and NβH heterocycles (III) provides access to the stable phosphorus ylides (IV) in high yields.
X-ray structural analysis and theoretical studies of new phosphite-derived ylides
β Scribed by Mohsen Rostamizadeh; Malek Taher Maghsoodlou; Sayyed Mostafa Habibi-Khorassani; Nourallah Hazeri; Faramarz Rostami Charati; Mohammad Amin Kazemian; Brian W. Skelton; Mohamed Makha
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 341 KB
- Volume
- 22
- Category
- Article
- ISSN
- 1042-7163
- DOI
- 10.1002/hc.20739
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β¦ Synopsis
The reaction between dialkyl acetylenedicarboxylates and NH heterocyclic compounds in the presence of triethyl phosphite leads to stable phosphorus ylide derivatives in good yields. The X-ray crystallographic data and theoretical study show that there is a resonance between two bonds of C 19 P 1 and C 191 O 191 in phosphorus ylide 4d. This compound crystallizes in the orthorhombic system, space group
π SIMILAR VOLUMES
## Abstract The reaction between dialkyl acetylenedicarboxylates and NH heterocyclic compounds in the presence of trialkyl phosphite leads to stable phosphorus ylide derivatives in good yields. The xβray crystallographic data and theoretical study show that there is a resonance between two bonds of
Ar = p-tolyl or phenyl), have been C-acylated by acetic anhydride to obtain new types of phosphorus ylides. Synthesis and characterization of six phosphorus ylides of the type Ar 3 PC(COCH 3 )(COR) are reported. The reaction of {(p-tolyl) and {Ph 3 PCHCOOCH 2 C 6 H 5 } (VI) with acetic anhydride in
## Abstract Extended Xβray absorption fine structure spectroscopy and Xβray absorption near edge structure, Xβray fluorescence spectroscopy, and Xβray powder diffraction have been used to study the local calcium environment in four solβgelβderived bioactive calcium silicate glasses of the general f