The Propyltriphenylphosphonium bromide, with the CAS registry number 6228-47-3 and EINECS registry number 228-330-2, has the systematic name of triphenyl(propyl)phosphonium bromide. It is a kind of hygroscopic chemical, and belongs to the following product categories: Phosphonium Compounds; Synthetic Organic Chemistry; Wittig & Horner-Emmons Reaction; Wittig Reaction. And the molecular formula of this chemical is C₂₁H₂₂BrP.

The physical properties of Propyltriphenylphosphonium bromide are as followings: (1)#H bond acceptors: 0; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 5; (4)Polar Surface Area: 0 Å².

Uses of Propyltriphenylphosphonium bromide: It can react with cyclohexanone to produce propylidene-cyclohexane. This reaction will need reagent NaH, and the solvents dimethylsulfoxide and pentane. And the yield is about 40%. 

 
You should be cautious while dealing with this chemical. It irritates eyes, respiratory system and skin, and it is also harmful by inhalation and in contact with skin. Therefore, you had better take the following instructions: Wear suitable protective clothing, gloves and eye/face protection, and in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: [Br-].c1ccccc1[P+](c2ccccc2)(c3ccccc3)CCC
(2)InChI: InChI=1/C21H22P.BrH/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;/h3-17H,2,18H2,1H3;1H/q+1;/p-1
(3)InChIKey: XMQSELBBYSAURN-REWHXWOFAH