23463-79-8

Upstream product

• 23464-16-6 5-p-Tolyl-penta-2,4-diinal 
• 23464-20-2 5,5-Diethoxy-1-p-methylphenylpenta-1,3-diin 
• 33491-05-3 1-(2-bromoethynyl)-4-methylbenzene 
• 131291-96-8 ethyl 5-(4-methylphenyl)penta-2,4-diynoate 
• 471-25-0 Propiolic acid 
• 131292-06-3 ethyl 5-(4-methylphenyl)-3-oxo-2-triphenylphosphoranylidenepent-4-ynoate 
• 52188-06-4 ethyl 3-(4-methylphenyl)prop-2-ynoate 
• 62849-00-7 p-Tolyl-propynoyl chloride 
• 2227-58-9 3-(4-methylphenyl)prop-2-ynoic acid 

Downstream Products

• 131292-20-1 ethyl 7-(4-methylphenyl)-3-oxo-2-triphenylphosphoranylidenehepta-4,6-diynoate 
• 131292-19-8 5-p-Tolyl-penta-2,4-diynoyl chloride 

Relevant academic research and scientific papers

Flash Vacuum Pyrolysis of Stabilised Phosphorous Ylides. Part 4. Stepwise Construction of Terminal 1,3-Diynes, Conjugated Diacetylenic Esters and a Triacetylenic Ester

Thirteen examples of stabilised alkynol ylides 6 have been prepared and are found, upon flash vacuum pyrolysis (FVP) at 500 deg C, to undergo extrusion of Ph3PO to give the diacetylenic esters 7 in moderate yield.At 750 deg C the same ylides afforded terminal 1,3-diynes 8 although often in poor yield.For R = 2-MeSC6H4 both 7 and 8 undergo secondary loss of Me* and cyclisation to give 2-alkynylbenzothiophene derivatives 9 and 10 in low yield.The first example of an alkadiynol ylide 11 has been prepared and is converted by FVP at 500 deg C into the triacetylenic ester 12.