ChemInform Abstract: MACROEXPANSION METHODOLOGY. PART 2. MEDIUM-RING SYNTHESIS BASED ON AN EIGHT-UNIT RING-EXPANSION PROCESS

1982 ◽  
Vol 13 (11) ◽  
Author(s):  
P. A. WENDER ◽  
S. MCN. SIEBURTH ◽  
J. J. PETRAITIS ◽  
S. K. SINGH
Keyword(s):  
Ring Expansion ◽  
Expansion Process ◽  
Medium Ring ◽  
Ring Synthesis

ChemInform Abstract: New Route to Pyrido[1,2-b]pyridazinium Inner Salts. Evidence of a 1,3-Dipolar Cycloaddition-Ring Expansion Process.

ChemInform ◽  
2010 ◽  
Vol 30 (17) ◽  
pp. no-no
Author(s):  
Jesus Valenciano ◽  
Ana M. Cuadro ◽  
Juan J. Vaquero ◽  
Julio Alvarez-Builla
Keyword(s):  
Ring Expansion ◽  
Dipolar Cycloaddition ◽  
Expansion Process

ChemInform Abstract: Generation of Medium-Ring Cycloalkynes by Ring Expansion of Vinylogous Acyl Triflates.

ChemInform ◽  
2011 ◽  
Vol 42 (24) ◽  
pp. no-no
Author(s):  
Jumreang Tummatorn ◽  
Gregory B. Dudley
Keyword(s):  
Ring Expansion ◽  
Medium Ring

Preparation of Thieno[3,2-e][1,2]oxazepine, Thieno and [1]Benzothieno-[3,2-g][1,4]oxazonine, and 5H-Thieno and 1H-[1]Benzothieno-[3,2-h][1,5]oxazecine Derivatives by Ring Expansion Methods. X-Ray Crystal Structure of 1-Phenyl-1,3,4,5,6,7-hexahydro[1]benzothieno-[3,2-g][1,4]oxazonine-5-carbonitrile

1988 ◽  
Vol 41 (12) ◽  
pp. 1815 ◽  
Author(s):  
JB Bremner ◽  
EJ Browne ◽  
LM Engelhardt ◽  
CS Greenwood ◽  
AH White
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Tertiary Amine ◽  
Cyanogen Bromide ◽  
Crystal And Molecular Structure ◽  
Ring Expansion ◽  
Standard Methods ◽  
X Ray ◽  
Medium Ring

10-Phenyl-4,5,6,7,8,10-hexahydrothieno[3,2-g][1,4]oxazonine-6-carbonitrile (6a) and 11-phenyl-4,6,7,8,9,11-hexahydro-5H-thieno[3,2-h][1,5]oxazecine-6-carbonitrile (7a) were prepared in moderate yields by cyanogen bromide-induced ring expansion of tetrahydrothieno [2,3- c] pyridinylalkanol precursors (4a) and (5a), respectively. 1-Phenyl-1,3,4,5,6,7-hexahydro[1]- benzothieno [3,2-g][1,4]oxazonine-5-carbonitrile (6b) and 1-phenyl-3,4,5,6,7,8-hexahydro-1H- [1] benzothieno [3,2-h][1,5]oxazecine-6-carbonitrie (7b) were similarly prepared from the [1] benzothieno [2,3-c] pyridinylalkanol precursors (4b) and (5b). The medium-ring cyanamides (6b) and (7b) were converted by standard methods into their N-methyl analogues (8b) and (9b). 6-Methyl-8-phenyl-4,5,6,8-tetrahydrothieno[3,2-e][1,2] oxazepine (13) was prepared by thermal Meisenheimer rearrangement of the corresponding tertiary amine N-oxide (12). The compounds (6a, b), (7a, b) and (13) are each the first reported examples of new heterocyclic systems. The crystal and molecular structure of (6b) has been determined by X-ray crystallographic methods.

Catalytic Ring Expansion of Cyclic Hemiaminals for the Synthesis of Medium-Ring Lactams

2015 ◽  
Vol 127 (34) ◽  
pp. 10143-10146 ◽  
Author(s):  
Wanxiang Zhao ◽  
Hui Qian ◽  
Zigang Li ◽  
Jianwei Sun
Keyword(s):  
Ring Expansion ◽  
Medium Ring

Development and Validation of Numerical Model for Predicting Electromagnetic Expansion of Composite Rings

2013 ◽  
Vol 198 ◽  
pp. 627-632
Author(s):  
Jacek Janiszewski ◽  
Robert Panowicz
Keyword(s):  
Numerical Model ◽  
Ring Expansion ◽  
Constitutive Relationship ◽  
Numerical Code ◽  
Expansion Process ◽  
Ring Specimen ◽  
Good Convergence ◽  
Composite Ring ◽  
High Strain Rate Deformation ◽  
Development And Validation

In the present work, the description of a numerical model for predicting the electromagnetic composite ring expansion process and validation of a developed numerical code is presented. The strength response of rings materials under high strain rate deformation was described by using the well-known JohnsonCook constitutive relationship. Numerical considerations and experimental validation were performed for a composite ring consisted of a copper drive ring and X37CrMoV51 steel ring specimen. The analyses of the obtained results allow to find out that good convergence of theoretical and experimental data was achieved.

scholarly journals Synthesis of Benzannulated Medium-Ring Lactams via a Tandem Oxidative Dearomatization-Ring Expansion Reaction

2018 ◽  
Vol 24 (50) ◽  
pp. 13063-13063 ◽  
Author(s):  
Tezcan Guney ◽  
Todd A. Wenderski ◽  
Matthew W. Boudreau ◽  
Derek S. Tan
Keyword(s):  
Ring Expansion ◽  
Oxidative Dearomatization ◽  
Ring Expansion Reaction ◽  
Medium Ring
Sign in / Sign up

Export Citation Format

Share Document