Abstract: Sweetening agents of the formula: ##STR1## wherein R is an heterocyclic group which, in a preferred embodiment, is a 2-cyanopyrid-5-yl or 2-cyanopyrimidin-5-yl group, A is O, NH or NCN, NH being able to be satisfied in hydrochloride form, n is 1 or 2 and B is COOH or a sodium, potassium, ammonium, calcium or magnesium salt.

Abstract: Sweetening agents of the general formula: ##STR1## wherein R is a saturated or unsaturated, acyclic, cyclic or mixed hydrocarbon group having 5 to 13 carbon atoms, wherein R' is, in a preferred embodiment, a 4-cyanophenyl or 2-cyanopyrid-5-yl group, and wherein n is equal to 1 or 2.

Abstract: Substituted guanidines and ethanamidines are provided as high potency sweetening agents.

Abstract: Sweetening agents, characterized in that they conform to the following formula: ##STR1## wherein: A is an imino (.dbd.N--), iminium (.dbd.N.sup.+ <), methylene (.dbd.C<) group, the iminium group being able to be salified by a physiologically acceptable anion;m and n are number equal to 1 or 2;B:when n=1, represents H, CN, OCH.sub.3, NO.sub.2, SO.sub.2 R, SOR, SO.sub.2 NHR, SO.sub.2 NR.sub.2, wherein R is an alkyl, cycloalkyl or aryl group having up to 10 carbon atoms;when n=2, represents H, CN, OCH.sub.3 ;X:represents CN, NO.sub.2, when B is H, CN, OCH.sub.3 ;represents CN, NO.sub.2, COCH.sub.3, CHO, Cl, CF.sub.3, F, H, when B is NO.sub.2, SO.sub.2 R, SOR, SO.sub.2 NHR, SO.sub.2 NR.sub.2 ;M is a hydrogen atom or a physiologically acceptable organic or inorganic cation.

Abstract: Sweetening agents of general formula: ##STR1## wherein: X is a CN, COOC.sub.1 -C.sub.3 alkyl, COC.sub.1 -C.sub.3 alkyl, CONHC.sub.1 -C.sub.3 alkyl, SO.sub.2 C.sub.1 -C.sub.3 alkyl, SOC.sub.1 -C.sub.3 alkyl, SO.sub.2 NHC.sub.1 -C.sub.3 alkyl, NO.sub.2, F, Cl substituent;n is a number equal to 0 or 1;M is a hydrogen atom, or an organic or inorganic physiologically acceptable cation;Y is a COOC.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkyl, CH.sub.2 OH, CHOHCH.sub.3, CF.sub.3 substituent;Z is a C.sub.1 -C.sub.5 n-alkyl, isobutyl, isopentyl, phenyl, cyclohexyl, benzyl, cyclohexylmethyl, CH.sub.2 C.sub.6 H.sub.4 OH(p), CH.sub.2 OC.sub.1 -C.sub.4 alkyl, CH.sub.2 COOC.sub.1 -C.sub.4 alkyl, CH.sub.2 SC.sub.1 -C.sub.4 alkyl, CH.sub.2 CH.sub.2 SCH.sub.3, CH.sub.2 CH.sub.2 SO.sub.2 CH.sub.3, COOC.sub.1 -C.sub.4 alkyl, COOC.sub.3 -C.sub.7 cycloalkyl, CONHC.sub.2 -C.sub.4 alkyl, CONHC.sub.3 -C.sub.7 cycloalkyl, CONHC.sub.3 -C.sub.7 thiacycloalkyl, or CONHCH.sub.2 COOCH.sub.3 group;characterized in that A is an N--CN group.