The Acetaldehyde,2-(triphenylphosphoranylidene)-, with the cas registry number 2136-75-6, has the IUPAC name of 2-(triphenyl-λ5-phosphanylidene)acetaldehyde. This is a kind of pink to brown crystalline powder, and is sensitive to air. Besides, it is combustible and incompatible with strong oxidizing agents, with the product categories including Wittig Reagents; Synthetic Organic Chemistry; Wittig & Horner-Emmons.

The physical properties of this chemical are as follows: (1)ACD/LogP: 3.36; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.36; (4)ACD/LogD (pH 7.4): 3.36; (5)ACD/BCF (pH 5.5): 209.5; (6)ACD/BCF (pH 7.4): 209.5; (7)ACD/KOC (pH 5.5): 1596.27; (8)ACD/KOC (pH 7.4): 1596.27; (9)#H bond acceptors: 1; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 4; (12)Polar Surface Area: 26.88; (13)Index of Refraction: 1.62; (14)Molar Refractivity: 92.08 cm³; (15)Molar Volume: 262 cm³; (16)Polarizability: 36.5 ×10^-24 cm³; (17)Surface Tension: 48.2 dyne/cm; (18)Density: 1.16 g/cm³; (19)Flash Point: 239.6 °C; (20)Enthalpy of Vaporization: 70.75 kJ/mol; (21)Boiling Point: 472.6 °C at 760 mmHg; (22)Vapour Pressure: 1.2E-08 mmHg at 25°C; (23)Exact Mass: 304.101702; (24)MonoIsotopic Mass: 304.101702; (25)Topological Polar Surface Area: 17.1; (26)Heavy Atom Count: 22; (27)Formal Charge: 0; (28)Complexity: 344.

Use of this chemical: 4-nitro-benzaldehyde could react with Acetaldehyde,2-(triphenylphosphoranylidene)- to produce 3t-(4-nitro-phenyl)-propenal, with the following condition: solvent: benzene.

 
When you are dealing with this kind of chemical, you should be much more careful and then take some measures to protect yourself. Being a kind of irritant chemical to eyes, respiratory system and skin, it may cause inflammation to the skin or other mucous membranes. Therefore, remember to wear suitable protective clothing, and if in case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

In addition, you could convert the following datas into the molecular structure:
(1)Canonical SMILES: C1=CC=C(C=C1)P(=CC=O)(C2=CC=CC=C2)C3=CC=CC=C3
(2)InChI: InChI=1S/C20H17OP/c21-16-17-22(18-10-4-1-5-11-18,
19-12-6-2-7-13-19)20-14-8-3-9-15-20/h1-17H
(3)InChIKey: CQCAYWAIRTVXIY-UHFFFAOYSA-N