13151-05-8

Basic information

• Product Name: 4-METHYL-1-HEPTENE
• Synonyms: 1-Heptene, 4-methyl-;4-METHYL-1-HEPTENE
• CAS NO: 13151-05-8
• Molecular Formula: C₈H₁₆
• Molecular Weight: 112.21
• Mol File: 13151-05-8.mol
• Article Data: 3

Chemical Properties

• Melting Point: -103.01°C (estimate)
• Boiling Point: 112.5°C
• Flash Point: 15.5°C
• Appearance: /
• Density: 0.7130
• Vapor Pressure: 25.7mmHg at 25°C
• Refractive Index: 1.4080
• CAS DataBase Reference: 4-METHYL-1-HEPTENE(CAS DataBase Reference)
• NIST Chemistry Reference: 4-METHYL-1-HEPTENE(13151-05-8)
• EPA Substance Registry System: 4-METHYL-1-HEPTENE(13151-05-8)

Safety Data

• Hazardous Substances Data: 13151-05-8(Hazardous Substances Data)

Usage

InChI:InChI=1/C8H16/c1-4-6-8(3)7-5-2/h4,8H,1,5-7H2,2-3H3/t8-/m0/s1

Upstream product

• 187737-37-7 propene 
• 56298-90-9 β-oxy-δ-methyl-heptane 

Relevant articles and documents

Hafnocene catalysts for selective propylene oligomerization: Efficient synthesis of 4-methyl-1-pentene by β-methyl transfer

A series of hafnocene complexes (η5-C5Me 4R1)(η5-C5Me4R 2)HfCl2 with [R1, R2] = [H, H] (1), [Me, H] (2), [Me, Me] (3), [Et, Me] (4), [iPr, Me] (5), [SiMe 3, Me] (6), [tBu, Me] (7), [nBu, Me] (8), [tBu, Me] (9), [Et, Et] (10), [nBu, nBu] (11), [iBu, iBu] (12) was tested as catalyst precursors for propylene oligomerization. Upon activation with methylaluminoxane or [Ph 3C][B(C6F5)4]AliBu 3, complexes 2-4 and 8-12 catalyzed the dimerization of propylene to produce 4-methyl-1-pentene with selectivities ranging from 23.9 to 61.6 wt % in the product mixture. The selectivity was dependent on the nature of the substituents R1 and R2, with the highest value found for (η5-C5Me4iBu) 2HfCl2 (12). Rapid deactivation was observed for 5-7, whereas (η5-C5Me4H)2HfCl 2 (1) polymerized propylene. 4-Methyl-1-pentene is proposed to form by repeated 1,2-insertion of propylene into the hafnocene methyl cation, followed by selective β-methyl elimination. Detailed analysis of the byproduct distribution (isobutene, 1-pentene, 2-methyl-1-pentene, 2,4-dimethyl-1-pentene, 4-methyl-1-heptene, 4,6-dimethyl-1-heptene), determined by gas chromatography, was performed with the aid of a stochastic simulation involving rate constants for the propagation by insertion, β-hydride elimination, and β-methyl elimination. The rate of termination is dependent on the structure of the growing chain of the active species as well as on the bulkiness of the cyclopentadienyl ligands. The selectivity highly depends on the reaction conditions (pressure, temperature, concentration of methylaluminoxane). The rates of β-methyl elimination leading to 4-methyl-1-pentene were proportional to propylene pressure for 2-4 and 8-10 but practically independent from propylene pressure for the sterically bulkier derivatives 11-12.

On the Mechanism of Oligomerization of Propylene by (C5Me5)2MCl2/Methylalumoxane Catalysts (M=Zr, Hf)

In the oligomerization of propylene by (C5Me5)2MCl2 (M=Zr, Hf)/methylalumoxane, formation of abnormal oligomers such as 1-pentene(C5), 2,4-dimethyl-1-pentene(C7), 4-methyl-1-heptene(C8), and 2,4,6-trimethyl-1-heptene(C10) besides normal oligomers such as 4-methyl-1-pentene(C6) and 4,6-dimethyl-1-heptene(C9) is indicative of the mixing of unusual β-CH3 and usual β-H transfer terminations from each growing carbon chain which was initiated by insertion of propylene into either M-H or M-Me bond.