Acta Cryst. (2010). E66, o56  [ doi:10.1107/S1600536809051320 ]

4-(4-Chlorophenyl)-7,7-dimethyl-7,8-dihydro-4H-1-benzopyran-2,5(3H,6H)-dione

H. Shi

Online 4 December 2009

Key indicators

• Single-crystal X-ray study
• T = 298 K
• Mean (C-C) = 0.005 Å
• R factor = 0.062
• wR factor = 0.186
• Data-to-parameter ratio = 14.5

checkCIF/PLATON results

No syntax errors found




Alert level C
PLAT241_ALERT_2_C Check High      Ueq as Compared to Neighbors for         C6     
PLAT242_ALERT_2_C Check Low       Ueq as Compared to Neighbors for         C7     
PLAT242_ALERT_2_C Check Low       Ueq as Compared to Neighbors for        C15     
PLAT340_ALERT_3_C Low Bond Precision on  C-C Bonds (x 1000) Ang ..          6      
PLAT927_ALERT_1_C Reported and Calculated  wR2 * 100.0 Differ by .      -0.30      

Alert level G
PLAT128_ALERT_4_G Non-standard setting of Space-group P21/c   ....      P21/n      
PLAT793_ALERT_4_G The Model has Chirality at C3      (Verify) ....          R      

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   5 ALERT level C = Check and explain
   2 ALERT level G = General alerts; check

   1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   3 ALERT type 2 Indicator that the structure model may be wrong or deficient
   1 ALERT type 3 Indicator that the structure quality may be low
   2 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

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