Conformational Studies of Substituted Chromans: Crystal Structures of 2,2′-(1E,1′E)-(2,3-Dimethylchroman-2,4-diyl)bis(Azan-1-yl-1-ylidene)bis(Methan-1-yl-1-ylidene)Diphenol (I) and 2,2′-(1E,1′E)-(2-Ethyl-3-Methylchroman-2,4-diyl)bis(Azan-1-yl-1-ylidene)bis(Methan-1-yl-1-ylidene)Diphenol (II)

Author： Mague Joel   Theivarasu C.   Suresh D.   Balakrishna Maravanji  

Publisher： Springer Publishing Company

ISSN： 1074-1542

Source： Journal of Chemical Crystallography, Vol.40, Iss.12, 2010-12, pp. : 1129-1136

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

The title compounds C25H24N2O3 (I) and C26H26N2O3 (II) crystallize in the triclinic space group P-1 with cell parameters a = 8.981(1), b = 9.933(1), c = 12.369(2) Å, α = 78.537(2), β = 84.515(2), γ = 73.561(2)° Z = 2 (I) and a = 11.4630(9), b = 12.955(1), c = 16.154(1) Å, α = 70.425(1), β = 87.403(1), γ = 71.850(1)°, Z = 4 (II). In both compounds the phenolic groups in the Schiff base substituents form intramolecular hydrogen bonds with the imine nitrogen atoms thereby rendering these substituents nearly planar. A detailed analysis of the amount by which the heterocyclic ring deviates from planarity (extent of puckering) in these and a series of related molecules shows that the extent of the deviation is largely unaffected by the number, size and placement of substituents on this ring.The structures of the title compounds together with an analysis of published structures of related chromans indicate that the amount by which the heterocyclic ring deviates from planarity (extent of puckering) is largely independent of the number and placement of its substituents.

Related content

Synthesis and crystal structures of novel (4‐phenylthiazol‐2(3H)‐ylidene) benzamide and ((benzoylimino)‐3‐(9,10‐dioxo‐9,10‐dihydroanthracen‐1‐yl)‐4‐oxothiazolidin‐5‐ylidene)acetate derivatives

By  

HETEROATOM CHEMISTRY (ELECTRONIC), Vol. 28, Iss. 6, 2017-11 ,pp. : n/a-n/a (NaN)

John Wiley & Sons Inc

Access to resources Recommend Favorite

(E)‐2‐(4‐Arylbut‐1‐en‐3‐yn‐1‐yl)chromones as Synthons for the Synthesis of Xanthone‐1,2,3‐triazole Dyads

By  

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Vol. 2015, Iss. 21, 2015-07 ,pp. : 4732-4743 (12)

John Wiley & Sons Inc

Access to resources Recommend Favorite

Transition Metal Complexes Containing C2‐Symmetric Bis(imidazolin‐2‐imine) Ligands Derived from a 1‐Alkyl‐3‐arylimidazolin‐2‐ylidene

By  

ZAAC-JOURNAL OF INORGANIC AND GENERAL CHEMISTRY (ELECTRONIC), Vol. 44-2313, Iss. 12‐13, 2015-10 ,pp. : 2204-2214 (11)

John Wiley & Sons Inc

Access to resources Recommend Favorite

Transition Metal Complexes Containing C2‐Symmetric Bis(imidazolin‐2‐imine) Ligands Derived from a 1‐Alkyl‐3‐arylimidazolin‐2‐ylidene

By  

ZAAC-JOURNAL OF INORGANIC AND GENERAL CHEMISTRY (ELECTRONIC), Vol. 641, Iss. 12‐13, 2015-10 ,pp. : 2204-2214 (11)

John Wiley & Sons Inc

Access to resources Recommend Favorite

Investigation of Optical Spectroscopic and Computational Binding Mode of Bovine Serum Albumin with 1, 4‐Bis ((4‐((4‐Heptylpiperazin‐1‐yl) Methyl)‐1H‐1, 2, 3‐Triazol‐1‐yl) Methyl) Benzene

By  

JOURNAL OF BIOCHEMICAL AND MOLECULAR TOXICOLOGY (FORMERLY JOURNAL OF BIOCHEMICAL TOXICOLOGY), Vol. 29, Iss. 8, 2015-08 ,pp. : 373-381 (9)

John Wiley & Sons Inc

Access to resources Recommend Favorite