Proton magnetic resonance spectra of some organodiphosphorus compounds

Abstract

The principal characteristics of the p.m.r, spectra of 21 previously unreported diphosphorus compounds and related substances are described, discussed, and compared with results already in the literature. A simple synthesis of unsymmetrical ethane-1,2-diphosphorus compounds is reported.

Boron Polycation Supported by Cyclic Bis(carbodiphosphorane)

“…Cyclic bis(CDP) 5 was synthesized over three steps from the literature-known propane-1,3-bis(methyldiphenylphosphonium) diiodide 2 [25] in 13 % overall yield (Scheme 1). The structure of 5 was determined by X-ray crystallography to reveal the two CDP moieties exist independently and have similar CÀ P bond distances and PÀ CÀ P bond angles compared to the reported monodentate CDP, hexaphenylcarbodiphosphorane (Figure 3).…”

Nuclear magnetic resonance spectrometry

“…Some sulfur-containing compounds related to long-chain fatty acids are described (1679) ; and qpectra analyzed for 1,2-dithiol-3-ones and 3-thiones (287) and thiophenes (2003,2000,1105). A variety of organophosphorous compounds have been reported (1489,1549,278) including dialkylamino derivatives (458) , alkynylamino derivatives (363) and acetylenic phosphorous compounds (552). Azoles have received a great deal of attention ( N H proton shifts are included in tabulations of hydrazone and acid hydrazide spectra (1860), various amine salts and hydrazines (96) , and urethanes (207).…”

Challenging synthesis of bisphosphonate derivatives with reduced steric hindrance

“…Building blocks 1 and 4 are commercially available but at relatively high costs, and therefore a more economical synthetic process is highly desirable. Limited syntheses of 4 have been reported based on the use of carbon disulphide [23] and diazomethane [24]; however, these reagents require special precautions for their use and have severe restrictions due to being toxic, highly flammable, and suspected carcinogens.…”