Welcome to LookChem.com Sign In|Join Free

CAS

  • or

658699-37-7

Post Buying Request

658699-37-7 Suppliers

Recommended suppliersmore

  • Product
  • FOB Price
  • Min.Order
  • Supply Ability
  • Supplier
  • Contact Supplier

658699-37-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 658699-37-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,5,8,6,9 and 9 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 658699-37:
(8*6)+(7*5)+(6*8)+(5*6)+(4*9)+(3*9)+(2*3)+(1*7)=237
237 % 10 = 7
So 658699-37-7 is a valid CAS Registry Number.

658699-37-7Upstream product

658699-37-7Downstream Products

658699-37-7Relevant articles and documents

Chasing Polycyclic Natural Products: 5/6/5- or 5/6/6-Carbotricyclic Scaffold Construction via Stereodivergent Diels-Alder Reaction of Chiral Hydrindanes and Their Boron Complexes

Bauer, Florian,Claasen, Birgit,Fellmeth, Thomas,Frey, Wolfgang,K?hn, Andreas,Laschat, Sabine,St?ckl, Yannick,Wank, Bianca,Zens, Anna

supporting information, (2022/02/25)

Chiral trans-hydrindanes (bicyclo[4.3.0]nonanes) are important building blocks of polycyclic natural products. In order to access 5/6/5- and 5/6/6-carbotricyclic scaffolds scope and limitation of [4+2] cycloadditions of tetrahydroindanones with various dienes were studied. Cyclopentadiene gave a tetracylic endo-(R,R)-diastereomer under acid-catalysis, whereas thermal conditions provided the endo-(S,S)-diastereomer with the opposite diastereofacial selectivity. The stereodivergent outcome was rationalized by high-level quantum-chemical computations which revealed the acid-catalysis to be a kinetically controlled reaction and the thermal cycloaddition to be under thermodynamic control. Stereochemical assignment of the cycloadducts was facilitated by conversion of the 1,3-dicarbonyls with BF3 ? OEt2 into BF2-chelate complexes. Subsequent thermal Diels-Alder reaction of BF2- or BBN-chelates (from 9-BBN-OTf) gave endo/exo-mixtures of the (R,R)- and (S,S)-diastereomers, while more elevated temperatures yielded primarily the endo/exo-(S,S)-diastereomers. Thermal [4+2] cycloadditions with 2,3-dimethylbutadiene proceeded with lower diastereoselectivity as the reaction was kinetically controlled according to calculations. Attempted Diels-Alder-reactions with furan gave furyl-substituted indanones rather than cycloadducts.

Post a RFQ

Enter 15 to 2000 letters.Word count: 0 letters

Attach files(File Format: Jpeg, Jpg, Gif, Png, PDF, PPT, Zip, Rar,Word or Excel Maximum File Size: 3MB)

1

What can I do for you?
Get Best Price

Get Best Price for 658699-37-7