186706-98-9

Upstream product

• 35449-95-7 [bis(ethyloxy)phosphoryl]methyl 4-chlorobenzenesulfonate 
• 186706-96-7 (4-tert-Butyl-2-{6-[5-tert-butyl-2-(dimethoxy-phosphorylmethyl)-3-methyl-phenyl]-3,7-dihydroxy-5-methoxy-5-oxo-5H-5λ⁵-dibenzophosphol-4-yl}-6-methyl-benzyl)-phosphonic acid dimethyl ester 
• 186776-81-8 meso-4,6-Bis(2-dimethoxyphosphorylmethyl-3-methyl-5-tert-butylphenyl)-5-methoxy-5-oxo-5H-5λ⁵-dibenzophosphole-3,7-diyl diacetate 
• 112921-26-3 meso-4,6-Bis(2-bromomethyl-3-methyl-5-tert-butylphenyl)-5-methoxy-5-oxo-5H-5λ⁵-phosphole-3,7-diyl diacetate 
• 112921-25-2 4,6-bis-(2-bromomethyl-3-methyl-5-t-butylphenyl)-5-methoxydibenzophosphole-3,7-diol 5-oxide 
• 112921-24-1 Methyl 4,13-dimethyl-2,15-di-tert-butyl-17-methoxy-17-oxo-5H,12H,17H-17λ⁵-phospholo<2,3:3,4;5,4:3',4'>dibenzo<1,2-c:1',2'-c'>bis<2>benzopyran 
• 112945-45-6 5,5'-di-iodo-1,1'-dimethyl-3,3'-di-t-butyl-10H,10'H-9,9'-dioxa-6,6'-biphenanthrenyl 

Relevant academic research and scientific papers

Synthesis of substituted dibenzophospholes. Part 9. Preparation of two water-soluble phosphinic-polyphosphonic acids

Several improvements, including a generally applicable method for reduction of aromatic nitro compounds to amines, were made to the preparation from 2,2′,4,4′-tetranitrobiphenyl of the meso atropisomer 1 of a bis-phosphonomethylated 4,6-diaryldibenzophosphole 5-oxide, previously obtained in impure form.2 A concomitant product 12 containing one phosphonomethyl group was formed by a novel intramolecular displacement. Both products were converted by a specially developed method3 into crystalline phosphinic-polyphosphonic acids, containing respectively four and three phosphonomethyl groups, which formed stable monodisperse solutions in water at pH 2-4. These solutions catalysed the hydration of 2-methylpropene to fert-butyl alcohol somewhat more efficiently than a toluene-4-sulfonic acid solution of equivalent acidity.