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21564-92-1

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21564-92-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21564-92-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,6 and 4 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 21564-92:
(7*2)+(6*1)+(5*5)+(4*6)+(3*4)+(2*9)+(1*2)=101
101 % 10 = 1
So 21564-92-1 is a valid CAS Registry Number.
InChI:InChI=1/C12H16/c1-9-7-11-5-3-4-6-12(11)8-10(9)2/h3-6,9-10H,7-8H2,1-2H3

21564-92-1SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 16, 2017

Revision Date: Aug 16, 2017

1.Identification

1.1 GHS Product identifier

Product name 2,3-dimethyl-1,2,3,4-tetrahydronaphthalene

1.2 Other means of identification

Product number -
Other names 6,7-Dimethyltetralin

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:21564-92-1 SDS

21564-92-1Relevant articles and documents

Promoted catalysts for hydrogenation of bicyclic aromatic hydrocarbons obtained in situ from molybdenum and tungsten carbonyls

Zakharyan,Onishchenko,Maksimov

, p. 22 - 31 (2018/02/09)

Promoted Мo and W catalysts have been prepared in situ via thermal decomposition of precursors, oil-soluble salts Mo(CO)6, W(CO)6, С°C16H30O4, and NiC16H30O4. TiO2, Al2O3, and ZrO(NO3)2 · 6H2O have been used as the acidic additives. Also, Mo and W unsupported sulfide catalysts have been prepared in the presence of elemental sulfur as the sulfiding agent. The catalysts have been characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. The activity of the catalysts prepared in situ has been evaluated in the hydrogenation reaction of bicyclic aromatic hydrocarbons by the example of model mixtures of 10% solutions of naphthalenes (unsubstituted naphthalene, 1- and 2-methylnaphthalenes, and 1,5- and 2,3-dimethylnaphthalenes) in n-hexadecane. The effect of the precursor/acidic oxide ratio on the activity of the formed catalyst has been found. Hydrogenation of bicyclic aromatic hydrocarbons has been conducted at a hydrogen pressure of 2 and 5 MPa and a temperature of 380 and 400°C for 2 h. Hydrogenation of the unsubstituted aromatic ring has been preferable due to the absence of steric hindrances. The degree of conversion of n-hexadecane under the reaction conditions has been 1.5–7.5% depending on the reaction temperature. It has been found that the activity of the sulfided catalyst in the conversion of 1- and 2-methylnaphthalenes is inferior to the activity of the unsulfided analogue, while partial replacement of TiO2 by Al2O3 results in a decrease in the conversion of the substrates as opposed to the unsulfided catalysts, in which the use of nanocrystalline Al2O3 promotes an increase in the conversion.

Conformational Analysis of 1- and 3-Isopropylindoles. A 1H NMR and Molecular Mechanics Study

Nilsson, Ingemar,Berg, Ulf,Sandstroem, Jan

, p. 491 - 500 (2007/10/02)

The conformations of the isopropyl groups in a series of 1- and 3-isopropylindoles have been studied by 1H NMR and molecular mechanics technique.The isopropyl group is shown to assume both syn and an anti conformation, and the equilibrium between these is shown to depend on the steric size of the substituent in position 2.The syn form is relatively more favoured in the 3- than in the 1-isopropylindoles, which can be explained by differences in the lengths of the ring bonds to N-1 and C-3.The energy barriers to syn-anti exchange are 45-46 kJ mol-1 in the 1-iPr compounds when R2=Me or CO2Me.This barrier is lower in the 3-iPr analogues and could only be measured when R1=iPr, R2=Me (35 kJ mol-1).In the 1-iPr compounds a 3-Me group exerts no observable buttressing effect on a 2-Me group, unlike the situation in 1-iso-propylnaphthalenes, where introduction of a 3-Me group leads to an apparent diminution of the steric effect of the 2-Me group ("negative buttressing").In 1-isopropyl-2-methylindole a 3-Br also exerts a negative buttressing effect.

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