the required proportions are added in portions the mixture is maintained at a temperature comprised between 70 u00b0 and 90 u00b0 c under stirring for a further 1 2 hours then left to cool to ambient temperature under stirring a solid is obtained by filtration which is then dried under vacuum the supramolecular complexes thus obtained prove to be stable in the solid phase for at least 30 days at 23 u00b0 c u03b2cd 13 9 g in water 20 ml is introduced into a 2 neck flask at 25 u00b0 c the mixture consisting of a suspension is left under stirring 300 rpm for 15 minutes at 25 u00b0 c after this time the temperature is brought to 70 u00b0 c then a mixture of acetamiprid 0 802 g pbo 3 65 g and soitem 0 07 g is added over a 2 hour period the mixture is agitated for 1 hour at a temperature comprised between 70 u00b0 and 80 u00b0 c then left to cool to ambient temperature by means of filtration a white solid is obtained which is dried for 3 hours under vacuum 25 u00b0 c 1 mbar to provide 14 4 g of formulated product u03b2cd 13 9 g in distilled water 20 ml is introduced into a 2 neck flask at 25 u00b0 c the mixture consisting of a suspension is left under stirring 300 rpm for 15 minutes at 25 u00b0 c after this time the temperature is brought to 70 u00b0 c then a mixture of imidacloprid 0 933 g pbo.