39598-55-5

Upstream product

• 1034-49-7 (bromomethyl)triphenyl phosphonium bromide 

Downstream Products

• 57134-53-9 3,4-methylenedioxyphenylethyne 
• 17207-73-7 2-bromo-1-[3,4-methylenedioxyphenyl]ethylene 
• 77150-91-5 2-benzyloxy-4-methoxyphenylacetylene 
• 77150-97-1 1-bromo-3-(β-ionilidene)-1-propene 
• 128625-66-1 (Z)-2-(Benzhydrylidene-amino)-3-bromo-acrylic acid tert-butyl ester 
• 128625-67-2 (E)-2-(Benzhydrylidene-amino)-3-bromo-acrylic acid tert-butyl ester 
• 111037-31-1 Methyl (5S)-5-(Benzoyloxy)-7-bromohept-6-enoate 
• 80516-24-1 ethyl 2,3,4-trideoxy-2-C-methyl-4-C-methylene-6-O-benzyl-α-D-threo-hexopyranoside 
• 80516-22-9 ethyl 2,3,4-trideoxy-2-C-methyl-4-C-methylene-α-D-threo-hexopyranoside 
• 80516-23-0 ethyl 2,3,4-trideoxy-2-C-methy-4-C-methylene-6-O-benzoyl-α-D-threo-hexopyranoside 
• 73656-99-2 ethyl 2,3,4-trideoxy-2-C-methyl-4-C-methylene-6-O-triphenylmethyl-α-D-threo-hexopyranoside 
• 111037-26-4 (3R,5Z)-3-(Benzoyloxy)-1-bromoundeca-1,5-diene 
• 73656-98-1 methyl 2,3,4-trideoxy-4-C-methyl-2-C-methylene-6-O-(triphenylmethyl)-α-D-threo-hexopyranoside 
• 873-73-4 4-n-chlorophenylacetylene 

Relevant academic research and scientific papers

NEW EVIDENCE FOR AND NEW REACTIONS OF ORTHO-LITHIO YLIDS

While α-lithio ylid 2 may be generated from triphenylphosphonio-bromomethylid through halogen/metal exchange, the reaction of triphenylphosphonio-methylid 1 with sec- or tert-butyllithium produces nearly quantitatively the o-lithio ylid 3, which is stable at -60 deg C but slowly decomposes at higher temperatures via a cyclization product 5 to give the α-lithio phosphine 4.

3-(Substituted) vinyl cephalosporins

New 3-(substituted) vinyl cephalosporin compounds, e.g., 3-(2'-ethoxycarbonylvinyl)-7-phenoxyacetamido-3-cephem-4-carboxylic acid, which are useful as antibiotics, and 3-(substituted) vinyl cephalosporin compounds which are useful as intermediates in preparing antibiotic substances.