The 1,3,5-Triphenyl-4,5-dihydro-1H-pyrazole, with the CAS registry number 742-01-8, has the systematic name of 1,3,5-triphenyl-4,5-dihydro-1H-pyrazole. It is a kind of organics, and should be stored in the dry and cool environment. And the molecular formula of the chemical is C₂₁H₁₈N₂.

The characteristics of 1,3,5-Triphenyl-4,5-dihydro-1H-pyrazole are as followings: (1)ACD/LogP: 3.80; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.8; (4)ACD/LogD (pH 7.4): 3.8; (5)ACD/BCF (pH 5.5): 451.96; (6)ACD/BCF (pH 7.4): 451.96; (7)ACD/KOC (pH 5.5): 2767.71; (8)ACD/KOC (pH 7.4): 2767.72; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 3; (12)Polar Surface Area: 15.6 Å²; (13)Index of Refraction: 1.624; (14)Molar Refractivity: 96.14 cm³; (15)Molar Volume: 272 cm³; (16)Polarizability: 38.11×10^-24cm³; (17)Surface Tension: 43.7 dyne/cm; (18)Density: 1.09 g/cm³; (19)Flash Point: 228.3 °C; (20)Enthalpy of Vaporization: 71.34 kJ/mol; (21)Boiling Point: 453.9 °C at 760 mmHg; (22)Vapour Pressure: 1.99E-08 mmHg at 25°C. 

Preparation of 1,3,5-Triphenyl-4,5-dihydro-1H-pyrazole: This chemical can be prepared by 1,3-diphenyl-propenone and phenylhydrazine. The reaction will need menstruum ethanol. The reaction time is 12 hours with heating, and the yield is about 67%.

Uses of 1,3,5-Triphenyl-4,5-dihydro-1H-pyrazole: It can react with benzenediazonium; chloride to produce [4-(3,5-diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-phenyl-diazene. This reaction will need menstruum acetic acid. And the yield is about 40%. 

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: N\3=C(/c1ccccc1)CC(c2ccccc2)N/3c4ccccc4
(2)InChI: InChI=1/C21H18N2/c1-4-10-17(11-5-1)20-16-21(18-12-6-2-7-13-18)23(22-20)19-14-8-3-9-15-19/h1-15,21H,16H2
(3)InChIKey: FGCZQOHSWGMVPN-UHFFFAOYAR

The toxicity data is as follows: