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Allyl 2-(2,2-dimethyl-3a,6a-di-hydro-furo[3,2-d][1,3]dioxol-5-yl)-4-oxo-4H-chromene-3-carboxyl-ate.


ABSTRACT: In the title compound, C20H18O7, the dioxolane ring adopts an envelope conformation with the dimethyl-substituted C atom as the flap, and its mean plane makes a dihedral angle of 73.25?(2)° with the pyran ring mean plane. The furan ring makes dihedral angles of 67.43?(12) and 6.20?(11)° with the mean plane of the dioxolane and pyran rings, respectively. The O atom attached to the pyran ring deviates by 0.0219?(2)?Å from its mean plane. In the crystal, mol-ecules are linked via C-H?O hydrogen bonds, forming chains along [010] and enclosing R 2 (2)(9) loops. They stack along the a axis with ?-? inter-actions involving the 4H-chromene units [centroid-centroid distances of 3.6389?(13) and 3.6555?(13)?Å]. The terminal CH2=CH- atoms of the allyl acetate group are disordered over two sets of sites with a refined occupancy ratio of 0.717?(6):0.283?(6).

SUBMITTER: Fatima Z 

PROVIDER: S-EPMC3793755 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Allyl 2-(2,2-dimethyl-3a,6a-di-hydro-furo[3,2-d][1,3]dioxol-5-yl)-4-oxo-4H-chromene-3-carboxyl-ate.

Fatima Zeenat Z   Srinivasan Thothadri T   Rao Jonnalagadda Naga Siva JN   Raghunathan Raghavachary R   Velmurugan Devadasan D  

Acta crystallographica. Section E, Structure reports online 20130713 Pt 8


In the title compound, C20H18O7, the dioxolane ring adopts an envelope conformation with the dimethyl-substituted C atom as the flap, and its mean plane makes a dihedral angle of 73.25 (2)° with the pyran ring mean plane. The furan ring makes dihedral angles of 67.43 (12) and 6.20 (11)° with the mean plane of the dioxolane and pyran rings, respectively. The O atom attached to the pyran ring deviates by 0.0219 (2) Å from its mean plane. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bon  ...[more]

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