pressure to afford the title compound which was then obtained as a white crystalline phase from recrystallization from diethylether yield u2267 90 mp 229 232 u00b0 c of calix 4 arene crown ethers the calix arenes having 1 3 alternate conformational structures show a characteristic nmr peak which is read as a singlet peak with an intensity of 8 hydrogens at near 3 80 ppm consistent with this the peak at 3 80 ppm in the nmr spectrum confirmed that the compound has a 1 3 alternate conformational structure with reference to the nmr spectra of proton for the compound the multiplet peaks which were read over 7 12 6 55 ppm represented 16 and 4 hydrogens of the benzene ring from the singlet peak with an intensity of 4 hydrogens which was read at 4 37 ppm the ether ring was also confirmed the multiplet peak with an intensity of 12 hydrogens over 3 65 3 32 ppm resulted from the overlap of the peak from the italicized hydrogens of och 2 ch 2 ch 3 with the peak from the hydrogen of the ether ring and the singlet peak with an intensity of 8 hydrogens at 3 75 ppm represented hydrogens of methylene connected to benzene rings the multiplet peak over 1 25 1 16 ppm with an intensity of 4 hydrogens was contributed from the italicized hydrogens of och 2 ch 2 ch 3 finally the triplet peak at 0 65 ppm with an intensity of 6 hydrogens corresponded to.