The CAS register number of Allyl triphenylphosphonium chloride is 18480-23-4. It also can be called as Phosphonium, triphenyl-2-propen-1-yl-, chloride (1:1) and the systematic name about this chemical is Triphenyl(prop-2-enyl)phosphanium chloride.

Physical properties about Allyl triphenylphosphonium chloride are: (1)#H bond acceptors: 0; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 5; (4)Polar Surface Area: 0Ų.

Uses of Allyl triphenylphosphonium chloride: It reacts with 3-Formyl-2,5-dihydro-2,2,5,5-tetramethyl-1H-pyrrol-1-yloxy radical to get 1-Oxyl-3-(1,3-butadienyl)-2,2,5,5-tetramethyl-3-pyrroline. This reaction needs solvent dioxane. The reaction time is 24 hours. The yield is 35 %.

When you are using this chemical, please be cautious about it as the following:
It is irritating to eyes, respiratory system and skin. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36:Wear suitable protective clothing. People must wear suitable gloves and eye/face protection.

People can use the following data to convert to the molecule structure.
1.SMILES: [Cl-].C(=C)\C[P+](c1ccccc1)(c2ccccc2)c3ccccc3
2.InChI: InChI=1/C21H20P.ClH/c1-2-18-22(19-12-6-3-7-13-19,20-14-8-4-9-15-20)21-16-10-5-11-17-21;/h2-17H,1,18H2;1H/q+1;/p-1 
3.InChIKey: FKMJROWWQOJRJX-REWHXWOFAQ
4.Std. InChI: InChI=1S/C21H20P.ClH/c1-2-18-22(19-12-6-3-7-13-19,20-14-8-4-9-15-20)21-16-10-5-11-17-21;/h2-17H,1,18H2;1H/q+1;/p-1