NOVELTY - Synthesizing dialkyl haloalkylphosphonates and dialkyl haloalkyloxyalkylphosphonates, comprises: heating reaction mixture containing dihaloalkane or bis(haloalkyl)ether and trialkyl phosphite by microwave irradiation of 2.45 GHz; and reacting the first dihaloalkane or bis(haloalkyl)ether halogen atom with a trialkyl phosphite to form dialkyl haloalkylphosphonate or dialkyl haloalkyloxyalkylphosphonate, where the reaction of the halogen atom with the remaining trialkyl phosphite leads to the synthesis of bisphosphonate, which no longer occurs at the achieved reaction temperature.    USE - The method is useful for synthesizing dialkyl haloalkylphosphonates or dialkyl haloalkyloxyalkylphosphonates (claimed), including diisopropyl 2-chloroethylphosphonate, 2-(2-chloroethoxy)ethylphosphonate, diisopropyl 2-bromoethylphosphonate, diisopropyl bromomethylphosphonate, diisopropyl iodomethylphosphonate and diethyl 2-chloroethylphosphonate, which are useful: in agrochemistry; as detergents and chelating agents; and for preparing organic-inorganic catalysts (i.e. agents for a Wittig-Horner reaction), antiviral agents, anticancer agents, antimalarials, antibiotics and military nerve gases.    ADVANTAGE - The method: can be performed in the continuous-flow microwave reactor, and thus enables industrial production with minimal demands on an optimization of the reaction conditions for larger quantities, eliminates security risks, and dramatically reduces the spatial demands in production; and minimizes the need the usage of large-tonnage industrial reactors; does not use solvents; and is environmentally-friendly, faster and economical.    DETAILED DESCRIPTION - Synthesizing dialkyl haloalkylphosphonates and dialkyl haloalkyloxyalkylphosphonates via a microwave-assisted Michaelis-Arbuzov reaction of trialkyl phosphites with dihaloalkanes or bis(haloalkyl)ethers in a closed reaction vessel, comprises: heating the reaction mixture containing dihaloalkane or bis(haloalkyl)ether and trialkyl phosphite by microwave irradiation with a standard frequency of 2.45 GHz to achieve the reaction temperature which is specific for each individual type of halogen atom; and subsequently reacting the first dihaloalkane or bis(haloalkyl)ether halogen atom with a trialkyl phosphite to form the desired dialkyl haloalkylphosphonate or dialkyl haloalkyloxyalkylphosphonate, where the reaction of the halogen atom with the remaining trialkyl phosphite leads to the synthesis of bisphosphonate, which no longer occurs at the achieved reaction temperature.