Routes to carboxylic acid functional acrylonitrile copolymers via N-tert-butyl-N-(1-diethylphosphono-2,2-dimethylpropyl) free nitroxide based nitroxide-mediated polymerization

2012 ◽  
Vol 125 (5) ◽  
pp. 3963-3976 ◽  
Author(s):  
Valerie Consolante ◽  
Milan Maric ◽  
Alexander Penlidis
Keyword(s):  
Carboxylic Acid ◽  
Tert Butyl ◽  
Nitroxide Mediated Polymerization ◽  
Acrylonitrile Copolymers

Synthesis of Optically Active Hydroxyalkyl Cycloheptatrienes: A Key Step in the Total Synthesis of 6,11-Methylene-LXB4

Synlett ◽  
2020 ◽  
Vol 32 (01) ◽  
pp. 45-50
Author(s):  
Udo Nubbemeyer ◽  
Analuisa Nava ◽  
Lukas Trippe ◽  
Andrea Frank ◽  
Lars Andernach ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Total Synthesis ◽  
Structure Elucidation ◽  
Butyl Ester ◽  
Optically Active ◽  
Chiral Hplc ◽  
Reaction Conditions ◽  
Acid Product ◽  
Tert Butyl ◽  
Nabh4 Reduction

AbstractStarting from methyl cycloheptatrienyl-1-carboxylate, 6-acylation was successfully achieved employing glutaryl chloride in the presence of AlCl3 under controlled reaction conditions to furnish keto carboxylic acid product. After protection of this keto carboxylic acid as tert-butyl ester, reagent-controlled enantioselective reductions delivered configuration-defined methyl-6-hydroxylalkyl cycloheptatriene-1-carboxylates with up to 80% ee. Whereas simple NaBH4 reduction of the keto carboxylic acid and subsequent lactonization afforded a methyl-6-tetrahydropyranonyl cycloheptatriene-1-carboxylate. Resolution using chiral HPLC delivered the product enantiomers with up to >99% ee Finally, ECD analyses enabled structure elucidation. The products are used as key intermediates in enantioselective 6,11-methylene-lipoxin B4 syntheses.

scholarly journals Crystal structure of 2-(4-allyl-4-methyl-2-oxo-1,4-dihydro-2H-benzo[d]- [1,3]oxazin-6-yl)-5-cyano-pyrrole-1-carboxylic acid tert-butyl ester, C22H23N3O4

2014 ◽  
Vol 229 (2) ◽  
pp. 127-128 ◽  
Author(s):  
Chuanhong Zhang ◽  
Jianguo Lin ◽  
Gaochao Lv ◽  
Yang Cao ◽  
Shineng Luo
Keyword(s):  
Crystal Structure ◽  
Carboxylic Acid ◽  
Butyl Ester ◽  
Tert Butyl

Abstract C22H23N3O4, triclinic, P1¯ (no. 2), a = 6.992(3) Å, b = 8.159(4) Å, c = 18.778(8) Å, α = 92.118(7)°, β = 93.463(7)°, γ = 101.623(7)°, V = 1045.9 Å3, Z = 2, Rgt(F) = 0.0576, wRref(F2) = 0.1778, T = 296 K.

A new sterically hindered asymmetric zinc phthalocyanine as an efficient sensitizer for dye-sensitized solar cells

2021 ◽  
Author(s):  
Kevser Harmandar ◽  
Kevin Granados-Tavera ◽  
Merve Keskin ◽  
Mehmet Nebioğlu ◽  
İlkay Şişman ◽  
...  
Keyword(s):  
Solar Cells ◽  
Carboxylic Acid ◽  
Dye Sensitized Solar Cells ◽  
Zinc Phthalocyanine ◽  
Tert Butyl ◽  
Dye Sensitized ◽  
Anchoring Group ◽  
Sterically Hindered ◽  
Sensitized Solar Cells

An asymmetric zinc phthalocyanine dye (KH1) bearing three 2,6-di-tert-butyl-4-methylphenoxy donor groups and carboxylic acid anchoring group was synthesized as a sensitizer for dye-sensitized solar cells (DSSCs). The DSSC based on...

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