Citation:
	            
		            Hu  Sheng-Zhi, Chen  Ming-Dan, Liu  Xiao-Yun, Zhou  Yuan-Lang. Crystal Structure and Molecular Mechanics Calculations of the Addition Product of Acetylacetone and Methyl 1-Naphthoate, C17H18O4[J]. Acta Physico-Chimica Sinica,
							;1991, 7(02): 191-195.
						
							doi:
								10.3866/PKU.WHXB19910212
						
					
				
					
				
	        
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	                	The structure of the product from the [2+2] photocycloaddition of acetylacetone to methyl 1-naphthoate was determined by X-ray crystallography. Crystal data. C_(17)H_(18)O_4, triclinic, P_1~-, a=0.7401(1), b=0.7656(1), c=1.3882(1) nm, α=84.75(1), β=86.49(1), γ=65.08(1)°, V=0.7102 nm, Z=2, D_c=1.339 g·cm~(-3), μ(MoK_a)=1.0 cm~(-1), F(000)=304. The structure was solved by direct methods and refined to final R=0.049 for 2442 MoKa reflections. The particular bridged structure of the product molecule indicates a [2+2+2] intramolecular cycloaddition in succession to the primary [2+2] photocycloaddition. Molecular mechanics calculations confirmed further that the molecular structure of the ultimate product takes a configuration of comparatively favourable steric energy even though the bridged structure itself is rather strained.
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