Homologues of (5-alkoxymethyl-1,3-dioxan-5-yl)methyl-2-(trimethylammonio)et
hylphosphates were investigated using differential scanning calorimetry and
X-ray diffraction. The water saturated compounds show at a decrease in tem
perature subsequent transitions from a nonlamellar liquid-crystalline phase
to a lamellar gel phase and then at the long chain homologues to a lamella
r gelB-phase with interdigitation of the alkyl chains.